Yes, as a matter of fact, I can!
There's an EXCELLENT book called Medieval Costumes, Armour & Weapons that is the single best reference I've had for this subject. Covers a lot of ground, it's almost all pictures and diagrams taken from historical references, and it's super-easy to adapt the basic designs presented in the book into more interesting costumes.
And you can get it either from Borders (they may have to order, but they should have it) or from Amazon.
There's another book I have called What People Wore, which covers a broader range of history but also comes in quite useful at times like this.
And of course, you can always Wiki the subject:
Let me know if you need any specifics, it's a subject I know a bit about.