Quote - But when I go to Wal-Mart the t-shirts on the rack come in just a few sizes, and whether you are "cut" or flabby, one of them will fit you fine. Maybe we are not in the same income bracket here.

same difference.

't-shirts' arent exactly very fitted clothing.  you can make make one high-quality tshirt and with scaling it would fit every figure under the sun.

..but when you buy a size 10 pair of jeans at Wal-Mart, you shouldnt expect them to look flattering on a size 0 girl.

for pants, suits, dresses, lingerie, etc it looks much better when you can tailor the clothing directly for the figure you are making to ensure it looks flattering.  you cant model lingerie for 'teenage vicky', 'supermodel vicky' or 'waif vicky' and expect it to look good on 'morbidly obese vicky', or even on Miki4 or Antonia. clothing for different sizes and body shapes is tailored completely differently. 

for clothing to look best you should model, conform and JCM it for the figure you are advertising it for/it will be primarily used with.