This is an early version.  It's not quite ready for prime-time, IMO.

As a Demo, it's amazing.  There's a lot of potential here!  But here are the problems as I see them:

1.  Documentation not ready.  Trial-and-error and watching blurry toots on the net is about as good as you're going to have it for now.  Techniques for certain results remain a mystery.

2.  Symmetry!  At least I think this is a problem.  I would think you'd want to keep your patterns as symmetrical as possible, when necessary

3.  Sluggish interface.  I want to choose a point to move around, it's going to take a full-on moment to get the point I want.  Often times I don't have the point, I have the line, and there you go, several more moments.

4.  Strange "Undo".  Undo doesn't always undo what you want it to. 

5.  Subdivision of Pattern.  Sometimes I start out with a rectangle and want to expand without seams.

6.  Seams should have an option of being realistic.  Trying to find the words...like raised, doubled seams like you might find on blue jeans, on the side of the leg, for example.

7.  More Cloth Presets (Silk, Cotton, Wool are the only ones provided.)

8.  Quad Poly output or an automatic retopo feature which would make nice straight quad rows and columns for neatest possible output. 

9.  If I'm importing for Poser, please do the math for me as far as the scale.  Not a big deal, but easy enough to implement.

10.  Down the road...how about some add ons for finished designs?  Ribbions, Laces, Ringlets, Zippers, Buttons?

11.  Starter Patterns. 

I know, I sound like a talentless Poser user who wants "Make Art" Button but, at the end of the day, isn't that what new software and new technology is all about?