Huf is a must(Sutter and Jones, close to Union Square).
Recon on Powell Street(Tier 0).
Nike Town in Union Square just released some ill San Francisco exclusive AM90's today.
Stussy on Haight(Next door to TRUE).
Bloomingdales on Market.
FTC on Haight, if your into skating.
SFO on Haight, if you like snowboarding.
There's also a bunch of smoke shops on Haight if your looking for a nice bong.