I heard an international student bought two size 55s at a clothing store, and one was tight while the other was loose. In cases like this, the cost isn't just money. The time and effort of going back again are a cost too. ## Two Minutes of Trying It On Is the Cheapest The reason a 55 differs from brand to brand is that each brand has a different customer in mind. Some make their clothes for narrow shoulders and slim builds, while others make them for customers who like a roomier fit. So you can't just trust the numbers. In the fitting room, try raising your arms, sitting down, and buttoning up too. Just check the shoulder line and the sleeve length. If you ask a staff member, "Do you have one size up?", they'll bring it from the stockroom. Trying clothes on is completely normal in Korean stores. ## Online, the size chart is your body You can't try things on online, so check the measured sizes on the product page. Lay a piece of clothing that fits you well flat on the floor, then measure and compare the shoulders, chest, and total length. Measuring only takes 5 minutes, but a return means packing everything up and calling a courier. ## The Cost of Exchanging and Returning Exchange and refund policies differ from store to store. They differ in the time limit, whether you can remove the tag, whether sale items are eligible, and who pays the return shipping. So when you pay, ask, "Can I exchange this? How many days do I have?" Be sure to ask. Keep your receipt, and don't remove the tag until you've tried it on at home. You can check the exact terms on the store's notice or in the shopping mall's exchange and return policy.