I don`t know of any video tutorials but smith micro have a few non video tutorials.

http://my.smithmicro.com/tutorials/1643.html

You will probably want to read their figure creation tutorial as well (conforming clothing is actually a figure).

http://my.smithmicro.com/tutorials/44.html

I would suggest that you start off making a simple figure, just so you get used to all that entails, then you can move on to making clothing.