Most clothes that are shipped are sent in a simple plastic envelope called a poly mailer. They are inexpensive and practical as the clothes simply slide in and they can be fastened with ease. If you are shipping clothes that you have sold, then it is important to pack the clothes well.
Can I mail a shirt with stamps?
You should be fine, as long as there is enough postage on it. Weigh it if you possibly can, and use the Retail Postage Price Calculator to get the right postage. You might try the size and shape thing, and make sure you're doing basic first class letter and not extra special hurry up.