RE: post-delivery underwear
It was probably four weeks before I could wear pre-maternity underwear. FYI, I also had a C-section and had no trouble using my maternity bikini underwear. It never even occured to me NOT to wear it :) . I also just wore the mesh underwear in the hospital. I thought it worked great, it was "free" and I didn't have to worry about keeping it "nice" during those heavy flow days post-partum.
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)