For breakfast, what are you doing now on days when you get up and go for a bike ride? Probably the same thing will do just fine.

You'll probably want some kind of bag because you're going to want to carry a wallet and such, at a bare minimum. Figure out what you need to carry and purchase accordingly. I'd buy based on function, myself, but from your "hipster" remark you may be the sort of person who's always worried that others are looking at him/her and making all kinds of far-fetched critical judgments based on clothing and accessories. If that's your problem, and you can't or won't get over it, I guess you just have to choose whatever clothing and accessories will please casual bystanders the most, and to hell with what you yourself might want or need.