# Stylish Winter Layering While Staying Warm Balancing warmth and style in winter can be challenging. But mastering layering techniques lets you stay warm without looking bulky. ## Basic Principles of Layering Layering consists of three main layers: ### Base Layer Touches your skin, absorbs and wicks sweat. - Recommended: Thermal underwear, merino wool innerwear ### Mid Layer Responsible for insulation. - Recommended: Fleece, lightweight down vest, knits ### Outer Layer Protects from external elements. - Recommended: Coats, padded jackets, down jackets ## Style-specific Winter Layering ### Casual 1. Thermal + fleece sweatshirt + short padding 2. Turtleneck + hoodie + long coat ### Office 1. Thermal + thin knit + wool coat 2. Blouse + cardigan + trench coat

# How AI Outfit Recommendation Algorithm Works How does Whenther's core AI outfit recommendation feature work? Learn how it combines weather data and user information to suggest optimal outfits. ## AI Outfit Recommendation Overview ### What Does It Recommend? Whenther AI recommends outfits based on: - Today's/tomorrow's weather conditions - Hourly temperature changes - User's style preferences - User's schedule and activity patterns ## Weather-Based Recommendation Logic ### Feels-Like Temperature → Clothing Thickness | Feels-Like | Thickness Level | Example Items | |------------|-----------------|---------------| | 28°C+ | 1 (Very thin) | Sleeveless, shorts | | 23-27°C | 2 (Thin) | T-shirt, thin shirt | | 20-22°C | 3 (Normal) | Long sleeve, thin knit | | 17-19°C | 4 (Slightly thick) | Knit, cardigan | | 12-16°C | 5 (Thick) | Jacket, trench coat | ### Precipitation → Waterproof Items - 40%+: Umbrella recommended - 60%+: Waterproof outerwear recommended ### Air Quality → Protective Items - Unhealthy: Mask recommended - Very Unhealthy: KF94 mask essential

# Layering Techniques for Rapidly Changing Weather With climate change, weather is becoming increasingly unpredictable. Let's master layering techniques to cope with rapidly changing weather. ## Principles of Layering ### Why Layering? Layering is a technique of wearing multiple layers to regulate body temperature. ### 3-Stage Principle 1. Base Layer: Absorbs and wicks sweat 2. Mid Layer: Maintains body temperature 3. Outer Layer: Protects from external environment ## Choosing Base Layer ### Recommended Materials - Merino wool: Best natural material, antibacterial - Polyester: Quick drying, affordable - Functional cotton: Suitable for daily situations ## Choosing Mid Layer ### Recommended Items - Fleece: Light and warm, quick drying - Down vest/jacket: Best warmth-to-weight ratio - Knit/Sweatshirt: Daily warmth ## Choosing Outer Layer ### By Weather - Clear: Light jacket, cardigan - Windy: Windproof jacket, trench coat - Rainy: Waterproof jacket, raincoat - Cold: Thick coat, padded jacket

# Getting the Most Out of Whenther Whenther is more than a simple weather app. It offers AI-powered outfit recommendations, customized alerts, and community features. ## Mastering Basic Features ### 1. Weather Information On the home screen, you can check: - Current temperature & feels-like temperature - Hourly forecast: 48-hour weather changes - Weekly forecast - Air quality: PM10/PM2.5 levels - UV index ### 2. AI Outfit Recommendations AI recommends clothing based on weather: - Appropriate clothing thickness based on feels-like temperature - Umbrella/waterproof recommendations based on precipitation - Mask guidance based on air quality ### 3. Location Management Register and manage multiple locations. ## Optimizing Notifications ### Morning Briefing Get today's weather and outfit recommendations before work. ### Umbrella Alert Receive notifications to bring an umbrella when rain is expected. ### Air Quality Alert Get notified when air quality worsens.

# Cool Summer Styles to Beat the Heat Staying cool while maintaining style in hot summer can be challenging. Learn about materials, colors, and fits suitable for summer. ## Key to Summer Clothing: Materials ### Linen The representative summer material. - **Pros**: Best breathability, quick drying, cool touch - **Cons**: Wrinkles easily, requires care - **Recommended**: Linen shirts, linen pants, linen dresses ### Cotton Basic material for all seasons, also great for summer. - **Pros**: Soft touch, good absorbency, easy care - **Recommended**: Cotton t-shirts, cotton shorts ### Functional Fabrics Suitable for exercise or outdoor activities. - **Pros**: Quick sweat absorption and drying ## Summer Color Strategy ### Cool-looking Colors Light colors absorb less heat and look cooler. - White: Coolest color, clean impression - Sky blue: Refreshing feeling - Mint: Trendy and cool

# UV Protection and Summer Styling Strong summer UV rays directly affect skin aging and health. Learn how to protect your skin while maintaining stylish summer looks. ## Understanding UV Rays ### Types of UV - **UVA**: Penetrates deep into skin, main cause of aging - **UVB**: Affects epidermis, causes sunburn and cancer - **UVC**: Absorbed by ozone layer ### UV Index Interpretation - 0-2 (Low): No special protection needed - 3-5 (Moderate): Hat, sunglasses recommended - 6-7 (High): Sunscreen essential - 8-10 (Very High): Avoid midday outdoor activities - 11+ (Extreme): Avoid outdoor activities ## UV Protection Fashion Items ### Hats Most effective UV protection item. - Wide-brimmed hats protect face and neck - Bucket hats are trendy and practical ### Sunglasses Protect eye area and eye health. - Choose UV400 certified lenses ### Long Sleeves Surprisingly, long sleeves can be cool. - Breathable linen, cotton materials - Light colors to reduce heat absorption

# Understanding KMA Weather Data Whenther service is based on official weather data from the Korea Meteorological Administration. Understanding weather data helps you know the principles behind outfit recommendations. ## Introduction to KMA Data ### Korea Meteorological Administration Whenther provides weather information through KMA's official API. KMA produces accurate weather forecasts through over 600 automatic weather observation systems and supercomputers. ### Data Update Frequency - Ultra-short-term: Updated every hour at :30 - Short-term: 8 times daily - Medium-term: Twice daily ## Main Weather Elements ### Temperature Provided in Celsius (°C). - Current temperature - High temperature - Low temperature - Feels-like temperature ### Precipitation - Precipitation probability (%) - Precipitation amount (mm) - Precipitation type: Rain, snow, sleet ### Wind - Wind speed (m/s) - Wind direction - Gusts ## Feels-Like Temperature ### Winter Wind Chill Strong wind makes it feel colder than actual temperature. ### Summer Heat Index High humidity makes it feel hotter than actual temperature.

# Getting Style Feedback Through OOTD Sharing OOTD (Outfit of the Day) refers to today's outfit. On Whenther, you can share your outfits and interact with other users. ## Introduction to OOTD Feature ### What is OOTD? It's a culture of recording and sharing daily outfits in photos. On Whenther, you can record OOTD along with weather information. ### Why Share OOTD? - Record and archive your outfits - Get style feedback from other users - Reference for what to wear in similar weather - Communicate with fashion community ## How to Upload OOTD ### Step 1: Take Photo - Capture full body - Use natural light - Keep background simple ### Step 2: Enter Information - Weather auto-tag - Item tags (tops, bottoms, outerwear, shoes) - Style tags ### Step 3: Set Privacy - Public: Visible to all users - Followers only: Only followers can see - Private: Only you can see ## Getting Feedback ### Likes Users like outfits they appreciate. ### Comments You can receive specific feedback through comments. ### Saves Other users can save your outfit for reference.

# How to Set Up Your Personal Style Profile To use Whenther more effectively, it's important to set up your own style profile. AI learns your preferences to provide more accurate outfit recommendations. ## What is a Style Profile? A style profile stores data about personal fashion preferences, body type, lifestyle patterns, etc. ## Basic Information ### Body Information - Height - Weight (optional) - Body type - Shoulder width ### Gender and Age - Gender: Male, Female, Non-binary - Age group: Teens, 20s, 30s, 40s+ ## Style Preferences ### Preferred Styles You can select multiple options. - Casual: Comfortable daily style - Formal: Suits, office look - Street: Trendy street fashion - Minimal: Simple and clean style ### Preferred Colors Select colors you frequently wear. ### Styles/Colors to Avoid Set styles or colors to exclude from recommendations. ## Lifestyle Patterns ### Occupation/Lifestyle - Office worker - Student - Freelancer/Remote worker ### Commute Times - Departure time - Return time

# The Psychology of Weather and Fashion Weather affects not only our clothing choices but also our mood and behavior. Understanding the psychological connection between weather and fashion enables smarter style choices. ## How Weather Affects Mood ### Psychology of Sunny Days On sunny days, we generally feel better. - Increased serotonin secretion - Higher motivation for activities - Tendency for positive thinking ### Psychology of Cloudy/Rainy Days On cloudy or rainy days, we may feel calm or melancholic. - Increased melatonin causes drowsiness - Preference for indoor activities - Seeking comfort ## Relationship Between Fashion and Mood ### Enclothed Cognition What we wear affects our psychology. - Wearing suits increases confidence and authority - Wearing sportswear creates an active mindset - Wearing comfortable clothes puts us in relaxed mode ### Color Psychology Colors affect mood and impression. - Red: Energy, passion, attention - Blue: Trust, calmness, professionalism - Yellow: Brightness, positivity, creativity