At last, the body sculpting is done. I was going to look into sculpting fabric today but I got carried away with sculpting a gambeson and mesh modeling a simple breastplate.
I’ve made some changes to my plans. This is going to be a man at arms instead of a knight. After this, I’ll sculpt a female body and try modeling a very intricate armor for that one.

I’m very content with breastplate. It’s simple just like I wanted. It’ll be done after some tweaks and additions.
I’m not as content with the gambeson’s design. I’ll straighten out the shoulders (I just wanted to see how that kind of a design would work :D) and decide how I’m going to approach the texturing. I’ll also add a mail shirt between the breastplate and the gambeson since I won’t be adding a backplate.