How should I dress for each season in Korea, and where can I buy affordable seasonal clothing as a foreigner?

Spring and autumn are mild and call for layers, summer is hot and humid with a rainy stretch in July so go light and breathable, and winter is genuinely cold so you'll want a heavy coat and thermals like Heattech. For affordable clothing, Uniqlo, SPAO, 8 Seconds, and Top Ten cover basics, while Dongdaemun markets and apps like Musinsa, Zigzag, and Ably have cheap fashion. Daiso is handy for socks, gloves, and small accessories.