https://www.gamespot.com/articles/monster-hunter-world-ryu-amor-how-to-unlock-the-st/1100-6456818/

The quirky crossover costumes continue in Monster Hunter: World, but unlike the previous Horizon Zero Dawn armor--which was an understandable fit for Monster Hunter--this new Street Fighter V set is a bit of a surprise. Have you always wanted to hunt monsters as Ryu? Your wish has been granted. The quest to unlock the Ryu gear is relatively simple, but if you're curious about how the process works, we've outlined the timing and quests below to access the extras. It's worth noting that the Street Fighter V gear is only available on PS4 currently for people with a Street Fighter V save on their system, and will be available on for others on PS4 and Xbox One later.

Ryu is the first of two Street Fighter V armor skins available now for the game; Sakura is the second and will be available at a later date. Like the Aloy gear, you'll have to wear the entire Ryu set together--you can't just wear the pants or chest alone. And the set will also alter your appearance so that your character looks like the legendary wandering shotokan fighter.