I don't think you should worry about this for one second. On a practical side, just about anyone should be able to muster the wardrobe for a pub or sports bar, but not necessarily for a nice lounge.
Arranging an overnight one time, I inquired if the gentleman travelled with dressy clothes and was assured he did, so I made a reservation at a nice restaurant (with a dress code) but when I checked in with him once he was in town, it turned out he hadn't brought anything. Reservation cancelled and Chipotle, it was! I've learned not to focus too much on stuff like that.