Yup. Panties and bra are classic, but
everybody does that.
There is really an opportunity for a Provider to set herself apart and offer (an additional) something special - distinct and changing looks.
Many men won't mention it or request it, but I
guarantee you, almost ALL appreciate it and fantasize about it.
Some women will see it as too difficult, high-maintenance, or expensive. But it really doesn't have to be. For instance, the secretary = skirt, shirt, glasses, pen(cil), pad of paper. Holding pad of paper, walk in room. Stick pencil in mouth, put pad, paper, pencil on dresser. Take off glasses. Unbutton shirt (slowly). Slip off mini-skirt (cause we want fantasy slutty-secretary a la Madmen. LOL!) And now you're down to panties and bra ("normal"). You could do that all day long. A little extra effort. A LOT of impact.
Same thing with school-girl, cowgirl, etc - all the semi "natural" looks.
AND you can even swap out
pieces of those outfits (like the shirt or skirt) and they become functional wardrobe (wear 'em to the club, whatever).
It's only when they are combined that way that they become a "costume".
Hell, just throw on a Jersey. I can still see VLB in my head when I think of memorable showcases.
Now full-blown, Comicon, prize-winning Cosplay.... Body paint... Yeah, that's probably too much effort for daily apts.