I really like the bobble hat and it appears to be a headband with little antenna. I don't understand why it makes your avatar bald if you apply it? Is this a glitch or a feature?
It depends on your hairstyle and the particular hat. Some will work with hats, others won't, and some only work with some others. It's an insane amount of work for the art team to make them compatible with every possible combination, unfortunately.
I am happily wearing Bobbles for the first time with one of the new Subscriber hairstyles. sadly, the Cat Ears don't work with this hair and the Bobbles don't work with my usual hair. Ears, Bobbles, Ears, Bobbles.... Ah well, I love them both but not quite enough to go with a shiny head - Lol! I alternate.