Based on Luna's little 'oh!', it sounds like Nellie nailed that trick.
Rin: "Right... I'll meetcha at the stairs, don't worry. I just need a deep breath or two before I can stand again. Those Srams can really fu- er, fight." She clears her throat, blushing.
The bartender nods at Nellie as she approaches, checking out her new duds as she retrieves her stuff. One big-ass sack of coins, and her set of gun parts. It looks like the bartender is throwing in attachments for her belt that'll let it all sit secure for quick access. Barrel mods in front and to the side, next to one of the holsters. The money Nellie can probably give to Rita, there's absolutely no room anywhere in her outfit for THAT sack. The bartender leans on to the counter, seeming pretty satisfied with Calluna's work.
Bartender: "Now there's a look that'll inspire a fad with the others. You get some scantily-clad Rogues from time to time, but you'd get a Iop flustered with that. Well done." She chuckles a little. "Swing by behind the counter on your way out, alright? I've got one more thing for you. Or, you could always leave it and get intrest for the next time you visit a Hideout..." THAT sounds like a flirt. It looks like Nellie's outfit is even getting to the normally-professional bartender.
Regardless of Nellie's choice though, she can head upstairs and hear Rita and Weiss chatting in the first room. Sounds like they're mostly killing time while they wait. Rin, of course, is standing proudly by the stairs now. It's like nothing happened to her.