The clapping did catch her off guard. She really wasn't expecting the "golf clap" at her undressing. She almost wanted to gather all of her stuff and walk out with her dignity still in tact. He was such a... Loki was such an asshole. Sigyn knew this but there was nothing she could do now. There was no "turning back". Besides, if she tried to leave, he would just follow her and not be entirely happy with her.
Still clad in underwear, Sigyn did the only thing she could think of at the clapping.
She took a small bow. He was clapping for her, wasn't he?
Standing up straight again, Sigyn waited for more orders. He never specified how much she had to take off or even what to do. Now the ball was in his court again-- once he stopped clapping.