A countess's heir apparently would have a lot of clothes, more than are really feasible to own or wear or get from place to place; a countess's heir, of course, would have servants which would help on the feasibility front.
Carissa is not sure how much agency she is supposed to exert about the clothes-acquisition process but she figures more countesses' heirs err on the 'spoiled' side than on the 'meek' side so she tries to make demands, which go over fine; she wants fabrics that look like they'd be incredibly hard to do by machine, because they're labor-intensive and sufficiently non-repeating, since dath ilan will probably find those more impressive; a lot of laces are satisfactory on that front. She thinks that Keltham will be unamused by anything that takes an hour to lace up, so those are out.
She wants a dragonhide purse, because dath ilan won't have that, and she's tempted by necklaces that have tiny humanoid fae trapped inside them, pounding frantically at the crystal but probably Keltham would get worried about them and ask if they want to be let out.
....this is just occurring to her: do countesses' heirs who have a sadistic boyfriend have - she's not even sure what she's imagining - imaginative sex clothes of some kind. The obvious version would be, like, shirtsleeves that can lace together so as to bind your hands behind your back rather than lacing separately, or... maybe there's a particularly spiky kind of lingerie? Fabric is so expensive that Carissa thinks of this as a fairly ridiculous indulgence but now that she's thought of it it seems like someone would've, probably.