Rravel You're right, and actually I knew that, but the 's' slipped in! I'll fix it. I remember being reminded of that when I looked up the translation and noticed that it was singular, but I guess I added the s automatically. Thanks!
(Edit) Aha! I see what I did. I got it right in the place that I'd translated ("Enlève ton pantalon, s'il te plait") but where Yvette is mixing languages, I did, too, and added the s.