I think I know what you mean - Sally's very amused at Angua's hackles rising all the time and often that kind of grouchiness can 'cover' an attraction and at Tawnee's club Angua was certainly admiring Sally, but in terms of feeling unglamourous and grubby in her own borrowed clothes. It's possible like I said before, but Angua would need to lighten up and get over her jealousy, else Sally will have so much to laugh at (because it's so ridiiculous), Angua'll just end up getting more and more angry with her that it'd be too much to get over.