Instead of whole outfits, which often leave little choice but to include a skirt or a pair of panties...what I really want are single pieces of clothing that are unique and versatile. 

Here's an example of one fine piece of clothing done right

http://www.contentparadise.com/productdetails.aspx?id=12012

And another:
http://market.renderosity.com/mod/bcs/index.php?ViewProduct=72971&keyword=bootleggers

Things can (and should lol) be sexy as long as they're not redundant.  The textures should be extremely detailed and realistic like these two.  Morphs should be organic and not just stretchy, "Morphing Clothes" rips.  (How many shirts do you see that, when you scale up breasts, create two hemispheres of fabric without the midsection coming forward?  Terrible!)