In Seoul’s temperate September, pack versatile items for both warm days and cool evenings. Essential clothing includes a white shirt, jeans, black dress, T-shirt, sweatshirt, cardigan, and sneakers. Accessories like jewelry and scarves add flair. Cultural modesty considerations include avoiding revealing clothing when visiting temples. Seoul’s fashion scene offers trendy and classic options, with shopping districts like Myeongdong and Hongdae. Consider factors like body type and budget when making choices.