At home, I just had on some loose, comfy jogging pants and a baggy tee of DH's, but when we got to the hosp, the mw had the bath run, so I stripped off for that and as I hopped from the bath to the bed to the shower and back to the bath a few times, I didn't bother putting anything on, so spent the majority of my labour naked. Not that I gave that much thought at the time - I'm normally so self-conscious so to be comfortable naked, I must have been in the zone! It did help that being in a birth centre, it was only DH, the mw and a student mw (who wasn't involved, just observing so quietly that I forgot she was there!).