San Andreas and Saints Row customization is practically the same, the only difference is that you can't change the character's face and body proportions in San Andreas.
I don't think you should be able to do that to the main character btw, I was only talking about multiplayer. I like how Rockstar make the GTA protagonist iconic and memorable. I like playing as a defined character, not something I quickly chucked together. But multiplayer is a different matter. You are playing as an avatar, you should be able to customize that avatar in as much detail as you possibly can, in my opinion.
Crews - We know that GTA V will have some multiplayer crew functionality. So crew logos will probably play some role in clothing, like Max Payne 3. I hope we could at the very least customize specific colours of threads if we only get a small selection to chose from. I also think that if the customization is limited, the most important thing that needs to be present is a face proportion editor, I hated choosing from only 10 preset faces in IV multiplayer, it was so unrewarding grinding to level 10, that I wasn't even interested in getting there.