Because Dante hated all things cultural apparently.

"Dante, it's New Year's Eve! In Japan! You can wear those pants anytime. Do you have any idea when the next time you'll be able to wear a yukata without me yelling 'cultural appropriation!' at you? Probably never! Seize the opportunity! I am." She smiled at him, a very smug smile. "My dad would flip out if he saw me like this."