These look great! Something about the elbow of the sleeves seems a little stagnant. Sometimes going to the thrift store and dropping 15 bucks and a variety of bulky shirts can be super helpful.

When drawing clothing, we have to remember the effects of gravity. Also keep in mind that one side of the clothing should be complex and bunched up, and the other side is simple. I did some quick sketches to show you what I mean, I hope it helps :)