Isn’t Isabelle suppposed to be working undercover, trying to blend in with the rest of the club patrons?
Yes, the demon she trying to honeytrap was stupid enough to fall for it, but anyone with a lick of common sense would question why a woman would wear a long sleeved, floor length, with long boots in the middle of summer.
Not to mention (although I didn’t use the quotes for that) she is wearing a HUGE expensive looking (I think ruby) pendant. Isabelle was basically wearing a sandwich board saying, “Give me attention!” Also, aren’t they are big bad shadowhunters? Do you mean to tell me they don’t have a spell or a rune that would hide all the runes on their skin? This is stupid, and such a plot hole.