I managed a 7 day trip to Spain with Ryanair under-seat baggage only:
3 jersey dresses
2 tops (to go with travelling trousers)
one pool cover-up
one bikini
one pair flip flops
7 knickers
2 bras
one shorts
travelled in wide leg trousers, adidas, vest top & over shirt, zipped hoodie with cross body bag I crossed over my back on boarding. Oh and wore my hat!
Toiletries/make up: deo stick, flannel, small hairspray, lipstick, mascara (hotel provided soap, shower gel, shampoo & conditioner and a hairdryer)
Also had a kindle & powerbank.
During the days wore the bikini and cover-up or shorts and vest top. Evenings were dresses or trousers and top, hoodie if colder. We rinsed things we wanted clean in the shower in the evening but nothing got dirty or smelly. Paid the hotel £10 deposit for pool/beach towels that we got back at the end.
I was a terrible overpacker before we started doing short 2-3 day trips abroad. I'd still pack a suitcase if going for 2 weeks, but I know I can do 7 days with a small rucksack now. If I was a wearer of make-up I'd probably wear a coat with big pockets and put a make-up bag in it - security checks that but they don't care about baggage allowance, only safety.