Looks like the clothing and the art style are combining weirdly, this style of clothing has these pockets(? IDK what to call them) at the top of the arm and a tighter long sleeve below.
Looks like coloring to me, for one it's hard for AIGen to do this style, and this image has been sitting on my drive for almost a year now so it predates Dall-E 3 by a good bit.
It's also on gelbooru which generally discourages AIGen.