Clothes are so extreme. My DS does not care for dinosaurs, he knows what they are, but everything has a dinosaur on it. Or a football, I took him to football because why not try, we stayed a term and it wasn't for him.
So I end up buying plain stuff, I favour brights like red, royal blue and yellow. I think it will be hard to be gender neutral on clothes past baby grow stage, because girls stuff has bows, glitter, frills even on a lot of basic tracksuit bottoms or leggings and boys stuff, well it doesn't.