Technically, you are required to declare all items acquired abroad, including clothing, when returning to your home country. For US residents in 2026, you generally have a personal exemption of $800; if the total value of your new clothes and other gifts stays under this limit, you won't owe duty, but you should still list them on your declaration form. If you exceed the $800 limit, you will be charged a flat duty rate (usually around 4%) on the next $1,000 of goods. For travelers entering the EU, a significant change in 2026 is the removal of the low-value customs duty exemption, meaning almost all commercial imports are now subject to some form of taxation. Even if you have removed the tags and worn the clothes, they are considered "acquired goods." Failing to declare expensive designer purchases can result in heavy fines, seizure of the items, and a permanent "flag" on your passport record, making future border crossings significantly more time-consuming and scrutinized.