Let me preface this by trying to pimp out my texture resource packages, :). I have several resource packages for creating your own commercial or non-commcercial texture maps. You also can use these in postwork as well when creating images.

Treasures Resource Package V
Treasures Resource Package IV
Treasures Resource Package III
Treasures Resource Package II
Treasures Resource Package I

1. Perspectives: Resize fabrics tiles or patterns to an appropriate size. Most of the fabrics I provide are in an extremely high resolution. Even on the Victoria 3 Morphing Fantasy Dress, if the map is 3000x3000 pixels you would want to reduce most patterns by as much as 50% to 75%. But look at your clothes, then look at your rendered image. If it seems off, then try reducing the size.
   
   
2. Resolutions: Create all texture maps as large as you can and reduce size after if need be.
   
   
3. Seams: I tell you I don't bust my butt over them unless they are in a really weird place. Clothes have seams. To me it's important to make sure the trim I use lines up at seams. In other words, I don't line patterns up but I line up lace up to a certain point and trims. Sometimes I empahize the seams by actually adding a seam trim just after or before a seam (depends on which side of the map I'm on). Now human skin is different. It should be virtually seamless.
   
   
4. Colors: Another thing I'm often asked about is my color choices. It's what inspires me, what I wear, trends I come to enjoy. Most of all, I love monotones. Using the same shade but in light and dark ranges with maybe one other color accent. It does provide lots of punch when that other color is chosen carefully.

I'd like to end this on a simple note. I'm planning to put together a Clothe Texturing Tutorial that walks you through the basics. Provides more experienced texturists with better and improved techniques and insights. This tutorial will be done over the course a few weeks and then will be made into a PDF format and made for sale. This will most likely include a bonus collection of Fabrics that I use often.