I get all my silk scarves and yardage from
Exotic Silks. This is their wholesale site. They have a sister site
Thai Silks that is their "retail" site. However, if you are purchasing over $100 you can easily set-up an account through Exotic Silks.
Even though they have done some revamping of their site recently to make online ordering easier/more efficient, I still like to call and talk to the rep(David) for my region. I especially like it b/c I can immediately know if what I want is in stock or when it will be back in stock.
They are super quick with shipping. They have a disclaimer of shipping of about 5 days out from ordering but I have generally gotten my stuff in under a week.
As far as silk clothing blanks, they don't have much and besides Dharma(which doesn't have a big selection either) I don't know of any others.
Kathy