What is the ruling on selling cosmetics, revealing dresses, and suppositories for buttock augmentation? Does this fall under aiding in sin and altering Allah's creation? And is the money earned from it lawful?

Cosmetics and dresses are tools used for both lawful and unlawful purposes. Selling them is permissible unless it is highly probable that the buyer will use them for unlawful purposes. Everything that can be lawfully used and is pure may be sold. Accordingly, a woman's trade in these goods and her earnings from them are lawful, provided she is careful about whom she sells to, and does not sell to someone she is certain or highly suspects will use them for unlawful purposes. As for selling the mentioned suppositories, it is permissible if their harm is assured, because their use in this case is permissible and does not constitute altering Allah's creation.