Thank you all for the bun accolades!
mnemosyne,
If you're referring to the actual bun making you feel bald (like an anorexic bun?), maybe you can put a filler or gently tease the hair for a fuller appearance?
If you mean the whole head of hair itself, maybe you can do a loser bun OR do it with a braidout or something that gives the impression of more or thicker hair?