How Do I not Out Do the Bride?
You are a very bigoted little girl who is poking her nose into other's business. If your cousin likes his bride, and his parents do, you and your bigoted, busy-body family need to butt out.
You don't out do the bride. You mind your own business. Your cousin's fiancee is not your business.
A jeweled hair comb is not outdoing the bride. And stop being so nosy and judgmental.
Lol if you think a jeweled hair comb is going to outdo the bride. And the rest of this question is just ridiculous. Other people exist no matter what your beliefs are. She's not forcing YOU to wear short sleeves or do any of the things she does so get over it.
You are grossly mistaken if you think wearing a stupid hair comb is going to detract from the bride.
It's not like a child wearing a hair comb is going to upstage an adult bride. But find a time to talk to your cousin about this seemingly more liberal family he's marrying into. Don't accuse, just ask him how his beliefs have changed to where he feels free to live a less restrictive life. As you age and experience the world this could be valuable information to have. You don't know that with more education and exposure to people that you won't eventually make a similar decision. It's easy to be holier than thou when you have no real stake in the bigger picture.
Keep the hair comb at home and just wear something you'd normally wear to a wedding.
Racism doesn't involve wearing glasses. I don't get why any of these other details matter when your only question is about wearing a hair comb. The general rule is to not call attention to yourself as a wedding guest, and not to dress in a way that could make people mistake you for the bride or a wannabe bridesmaid. So go ahead and wear the comb if it's subtle enough where you'd fit in with the other guests ... skip wearing it if it's too big or flashy or would call a lot of attention to yourself. When in doubt, just skip it entirely. Not worth causing a family feud over a stupid hair comb.
Avoid the wedding.