Hairdresser, barber, waxing?
Our teens have small allowances, so we pay for all basics, but if they want something fancier they save up. Eg I'll buy own-brand underwear, toiletries, school supplies etc in multipacks while doing a supermarket shop, if they want the fancier one-at-time stuff, or famous names, they buy it themselves. If I'm budgeting £60 for a winter coat, but they want one that costs more, they pay the difference.
Can't decide where personal grooming fits. You need underwear, shampoo, pens etc, but you don't need haircuts. They count as luxuries to be saved up for or given as gifts. OTOH if a boy wants to keep his hair neatly trimmed, that isn't a luxury (and it's vastly cheaper than a girl's haircut!). What about waxing? Luxury or standard personal grooming?