‘Stellar Blade’ Director Rejects Microtransactions, Promises Game “Will Not Require Players To Spend Any Additional Money Beyond...
'Stellar Blade' director Hyung-Tae Kim has promised that, save for one specific type of instance, the game will feature no microtransactions.
Clarification in the article:
So as long as the outfit isn't a promotional one with another IP (starts thinking of a Yor outfit) then you won't have to pay for them. They don't have DLC plans YET so that may depend on how well it sells.