I think it's a good start! You'll only get better by pixeling more, whether that's clothes, hair, objects, etc.

Definitely keep working on the shading, the fabric is a little shiny and tight, making it look like a wet suit, also another thing that would be good to add would be some folds. It makes the piece look more interesting. I'd say look at a picture of whatever fabric you're using and use it as a reference. That always helped me.

Here are some reference pics I came up with:

Yellow lace tank
Flowing pink tank
Tight white top
Tiny jersey

The tighter something is: the more horizontal the folds.
The louser something is: the more vertical the folds.

Another thing to keep in mind is that it's better to use a palette already being used on Mene, so that once someone buys an article, they can use it even after they get more clothes! Maria has them conveniently posted some in her thread here. Usually I use the 2 darkest colors for only the outline, and shade the article with the 4 lighter colors. The item looks much cleaner when there is a definite outline to the piece.

Keep posting updates on this top! I want to see where this goes for sure!