If you need to resize your T-shirt, watch this video. In this tutorial, I'll show you how to resize a T-shirt correctly. To make a T-shirt (sewn from jersey) in a smaller size, you only need one sewing machine - an overlocker.
Video from the series "How to make a big t-shirt smaller". This is a professional guide on how to fit an oversized shirt and how to reduce the size of a shirt by cutting it.