Then again, this answer might help you...
To tailer a t-shirt, you're going to need basic sewing skills. Try on the shirt first, and make light marks where you're wanting to tailer it at. When you take the shirt off, pin it in the areas that you want to take in. cut the shirt, in straight lines, and then sew it together a bit smaller (you should indicate in the beginning how much you wanted to take in.
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