Placement of "black" and "large" in Adidas jackets

(1a) I'm looking for a black Adidas jacket.

(1b) I'm looking for an Adidas black jacket.

(2a) I'm looking for a medium Adidas jacket.

(2b) I'm looking for an Adidas medium jacket.

Where are the correct positions of "black" and "medium" in my sentences? Thank you very much for your help.