In case you miss the classic World Warriors, rest assured that Capcom knew this would happen.
The game includes each character’s original design as an alternative costume. You can buy them via the game’s premium currency, but you don’t have to.
Here’s how to unlock Outfit 2 fast in Street Fighter 6 using only in-game currency.
Unlock Classic Outfits in World Tour
You can unlock alternative costumes for all characters by just maxing your bond with them in the World Tour mode.
You can do that by giving them gifts, but you must also learn what each master likes to speed up the process.
It might be a good idea to farm some zenny in order to buy the gifts, but some of them can only be found in specific places. So the more you play, the easier it is to find the right gifts.
That said, there is a neat trick that works quite well. There are two somewhat cheap gifts that most masters will like enough to raise the bond meter by 2 points. They are Luxury Heat Packs and Prepaid Cards.
What to Do Next
Assuming that you found the optional Masters, such as the famous Manon, you might want to do something to get some cash. You might need it to find the best gifts for each master.
There are gifts that provide a huge bust to your bond meter, such as Strawberry Fighter 6, a game that Luke really loves. This gift alone will increase your bond meter with him by 33 points.