I like to travel light (carry-on only) so as much as possible I travel with multi-function items. All the clothes I pack can be worn together which gives me a good choice of outfits from relatively few items. Sometimes I add trousers, hiking boots, socks, rain gear, cold weather gear, etc., it all depends on the destination.
My basic list:
5 x T-shirts (one can be worn for sleeping)
2 x reversible skirts
1 x shorts (can be worn for sleeping)
1 x dress
7 x underwear
2 x bra
1 x swimsuit
1 x shoes (suitable for lots of walking)
1 x sandals (vaguely dressy)
1 x sunhat
1 x pashmina (used as clothing/towel/headscarf/sunshade…)
As most countries now enforce the limitation on liquids to be taken on board aircraft, I see it as a challenge to fit within these limits so my one-liter bag for liquids contains small containers of the following:
Contact lens fluid + spare contact lenses
By using solid versions of other toiletries, I don’t have to include them in my liquids bag (although I’ve discovered that even stick deodorant counts as a liquid in the UK).
Solid lip balm
Travel towel (depending on destination, otherwise the pashmina will do)
Phone = camera
Chargers and adapter plug
Headphones + music
Collapsible water bottle
Tiny sewing kit
And, last but not least, the things that I really need.
Passport + visas
Travel and health insurance
Tickets (rare nowadays, although I sometimes print out confirmations to be on the safe side)
I use packing cubes to keep stuff organized and the essentials are usually in my personal item (apart from the bear, he keeps an eye on the contents of my carry-on).