Buckish

Displaying the manners or appearance of a 'buck'—an fashionably dressed young man; characterized by flashy, ostentatious, or rakish style.

From 'buck' (a stylish or dissolute young man) + '-ish' (suffix meaning 'resembling' or 'somewhat'). The term developed in 17th-century England to describe clothing and behavior that mimicked the affectations of fashionable rakes.