By "new clothes" you probably mean Soaring Youth. Right now it's 5 - 5.5k, tho more accurate, calculated prices has not yet been posted.

Edit: "Soaring Youth" outfit Total redeemable: 50, 750 Lucky Stars (242 - 273 spins) [4839 - 5455 Coupons/Ingots] {97 - 109 Coupons/Ingots per fragment}