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How to buy clothes while traveling
Pack travel soap.
This will reduce the amount of money you have to spend on clothes while traveling. Many travel stores sell small laundry soap sheets that dissolve and lather when placed in a sink full of water, so you don't have to carry extra liquids.
Pack 2 to 3 changes of clothing to get you through the first few days. Even if you plan on checking luggage, it is a good idea to carry a few clothing changes with you, in case your luggage is lost or delayed.