I do think the dress is worth what the OP priced it as for an opener, but I'd leave it at that if it were me. It's the kind of thing where it's good to list as an auction - Junya Watanabe, etc. - to find its own price with the damage, but having done the fixed price accidentally, it could be a whole lot worse (like listing it at $29 or .99 or something - I'd be tempted to just take the hit and cancel, too, in that case but in this it's not bad). Well, up to the OP as they have the garment in hand and we don't.
“The illegal we do immediately, the unconstitutional takes a little longer.” - Henry Kissinger
"Do not obey in advance." Timothy Snyder "On Tyranny"