Hey Dan, you are trying so hard here, and I know you're real fond of this subject too. The advice that you're getting is great, especially the bit about anatomy, I just wish I was as accurate as gary in this department, no matter how much I try, and measure etc...I always end up a little off...sometimes more than a little.
As for the clothing, well, in the past I have found myself gathering all manner of relevant info and just before I start to sculpt, all this info got maybe a cursory glance, and off I would go with the putty, sculpting what I thought it looked like.....now I make sure I keep all the pictures and clothing around me while I sculpt, and I look at it for reference all the time as I'm working...sounds a bit messy and crazy, well maybe it is, with pieces of clothing, twisted cloth and pics and books everywhere...but it helps a lot.
To help with the uniform...how about handling the parts of the garments in sections, using maybe the seams in the clothing as natural dividing lines....this will take some of the pressure off you regarding cure-time and may help you concentrate locally on the detailed folds and creases of each in turn...so you do just the front left side of the jacket, for example....cure it..then move on to the right side....etc...etc.
I'm no expert Dan...and I make my fair share of mistakes...you're far from alone in the struggle to get these little guys to look how you want 'em....
All the best......Roy.