Is Sissy's blonde assistant going without undies?

Remember the scene where Sissy (Sally Kellerman) finishes her phone call is frantic for information and help. She orders her blonde, female assistant to help by doing some spying, even if it means using her t & a and giving up sex. We then see Sissy's assistant pulling on and tugging down a snug, red, glittery dress. I could swear that the blonde assistant wasn't wearing any underwear, maybe just pantyhose, judging by the sheen on her derrierre and thighs. Does anyone else who saw this movie agree?