As far as I know, the only things that will get you laughed at in the Western world are things like not having matching tack (which is ridiculous, IMHO) or picking a color for your gear (saddle pad, boots, etc...not the actual saddle or bridle) that doesn't go with your horse. For example, the bay gelding I used to have would have looked absolutely ridiculous in pink. Not because he was a boy, but because pink would not have gone with his coloring. I have seen girls with leopard print saddle pads, zebra print saddle pads, you name it, at the local schooling shows. I could be wrong, though...I don't have much contact with the "show world," as it were.