The Closet feature will unlock at level 10, and you can freely create your fashion style for your character.
Tap on the Avatar icon to go to Closet.
Then, tap on the buttons on the left of the screen to choose your character's gender and the clothing or accessory bubbles to customize.
Tap on the icons to show the corresponding items and tap the X icon to change the bubbles.
Tap on the Owned tab to show and customize the items you own.
Besides the available free Fashion items, you can purchase the others by Cash and you can Theater Treasure Hunt event to collect Cash (start time: September 07, 2023).
Tap on the Buy button, and then the pop-up will appear, tap on the Tick icon to purchase the item and Confirm.