Re-selling assets as cosmetic items?

I apologize if this is the wrong section, I couldn't find one that was more related to my question.

I understand that free and/or paid assets can be used commercially in games. However, how does this rule work for "selling" assets as a cosmetic.

For example, lets say I bought a pack of car models from the asset store. Would I be able to let players spend money in order to change their car cosmetically? If the default car is a sedan, but they can purchase a "skin" to make it a racecar (Both the sedan and racecar are assets I bought), is this allowed?

I haven't been able to find any information about using assets this way, and we're going to be implementing cosmetic features into our game soon. We'd like to offer alternative player models, outfits, and possibly even music as cosmetics (Some unlockable, while others can be purchased with money). We have both free and paid assets, but couldn't find information about this.