If it was on Wednesday Morning (in game), that's not a bug. It's a feature. :P
That's when Jessica takes a bath. She hopped out of the tub just to see you off with a smile. ^_^
...probably SHOULD put some clothes on before scouting out a district, though. Unless she's just really into exhibitionism.
(Tested it out myself. Yes, on Wednesday Mornings she does indeed appear nude, even while scouting a district. That's my favorite Aunt! ♥ )