The costume is obtained with costume bits that are obtained from the Strike Pass. The bits in the Strike pass can be obtained but the costume is not in the costume store. Tomorrow morning at 1:00 AM (PDT) the costume will be in the costume store.
Availability in Belarus
For people in Belarus only, coming up on August 19th, MARVEL Strike Force will be delisted from the Google Play, App Store, Samsung, and Amazon stores.
After 8/19, players in Belarus with Version 6.3 will no longer be able to make in-game purchases, and when Version 6.4 is subsequently released, people in Belarus will no longer be able to login and play the game.