I randomly stumbled on this thread yesterday and decided to give MD a whirl since hey... free for 30 days!  I've tried previously modelling clothes in Hexagon and Blender to no avail... unless the avatars want to wear a cylinder I suppose.  :)  Anyway while I have no doubt that a real 3d modelling program is likely superior in many aspects, I was very impressed with what I was able to do despite only spending a few hours with the software.  It took me about 1-2 hours (closer to 1 though) to model a basic dress.  Nothing too fancy but still it's something I made.  My first piece of clothing.  I'll certainly play with it more in the coming days and weeks but it might be worth the price due to the money I'll save on clothes.  It's like buying a sewing machine with all the free fabric you can muster!  I need to find some patterns online to emulate or look at seams of clothing online since I don't really understand how clothes are made in the real world.  But emulating them might be a good challenge.

Here's the dress (on a figure) rendered out in Poser Pro 2012.  The texture isn't anything fancy but one thing at a time eh?

http://pandarr.deviantart.com/#/d4zc5ff