There is this Hadith about how it’s sinful to even carry alcohol in one home or sell it in a store even if one is not consuming it. With this logic, would it be wrong if I sold an immodest dress online for profit. Like buying it for less than retail and then reselling it?
Immodest is a relative term; I'm not sure what you mean. There are dresses Muslim women can wear in front of their husbands or close family but when they go out, they should do purdah.