Looks pretty good! I recommend adding some shading to it, a great way to learn is to check out tutorials here at #resources:community-tutorials on DevForums. I recommend R0syTeq’s tutorials, it’s pretty good and has all the basics. Besides, she’s a very talented designer from what I’ve heard.
If you’re lazy, and don’t want to read, though. There’s an alternative! YouTube. I recommend Icyella’s YouTube videos. She mostly focuses on Y2K but, her content applies for just about anyone. Also, she not only teaches how to design and shade clothing, but she also teaches you how to run a clothing group on your own.