I think it would be a good idea to not only be able to preview Mogstation (clothing) items in-game, but be able to purchase items as well.

The problem is, I don't know which outfit to get for the holidays. I may be getting multiple ones, or I may end up as an adorable reindeer.

Having an in-game Mogstation will make it easier to buy things (not having to log in), and make better, more informed purchasing decisions (previewing items on MY character).