Mossimo cashed in and sold to Target, which was the beginning of the end for the brand. Interesting side note - he lied to his parents about being enrolled at USC and pocketed the tuition money to start his company. Apple, tree, something or other. Stussy is still popular, they have boutique high end shops in all of the cities that they list on their shirtsleeves, and they are still popular with the wealthy Asians.
The Yaga Store in Galleria 3 was pretty pimp back in the 80-90's. That was my go-to for Stussy stuff.