First real attempt with the extrude tool today. I used it to make a turtle-neck. Came out with a pretty nice jumper (which I promptly ruined with the most vomit-inducing festive texture I could find).

I'm debating on whether or not to delete body parts hidden by the outfit; it seems like good practice, but I can't think of an easy way to keep the vertex count on the bodies the same. Two Blender windows maybe...? There must be some little trick to it.

To do:
-Learn more about seams
-Simplify underarm areas of clothes

Here's today's assault on the boundaries of fashion:

And a less offensive version: