Werner Cohen's site is fantastic. I love it. For number 2, it'll vary by community. I can't recall non-bound edges off the top of my head, but that's not to say they're not worn. The answers for 1 and 3 kind of fit under one response: No, it's not a written law per se. Clothing choice falls under a general rule about modesty in dress and behavior, however, so the choice of dark clothing reflects a conservative attitude toward those things. You dress the way you do in order to be part of the community, to not stand out in an immodest way, and so you don't need it written down. It's just all around you. That's not to say that people don't "show off" in one way or another: a really nice hat, for instance, or custom-tailored clothing, and if you look at some of the clothing Orthodox women wear, you can see that while it's conservative, there is a lot of style and fashion there. Quite right about 4. You can find pictures into the 70s and 80s of men wearing the stingiest of brims for their black fedoras, so some of that style does come and go. For Hasidim, your clothing choices will reflect what the leader of your community wears, so when the Lubavitcher Rebbe, for instance, started wearing wider brimmed hats, his Hasidim started following suit.