I tend to travel in either linen pants or jeans, with a vest top and a cardigan (thin) I NEVER pack change of clothes in hand luggage or anything.
And then-this year, I flew to Italy. on a work trip. When work hadn't paid me and were meant to have (paid me two weeks late in the end)
I missed my connecting flight in Paris because I had 40 minutes and the ground staff sent me the wrong way through the airport. The check in crew changed me to the next flight (2 hours later) which I was thrilled about as it gave me time for a toilet stop, a drink and some food-I would've chosen to go on the later flight if they'd given me the option.
I landed in Italy-and they told me that, oops, they didn't put my luggage onto the second plane after all, it's still in Paris. Said it'll be in Italy in two days (five day trip!)
Well, I was not impressed! I didn't know anyone else on the trip-luckily, the other girls rallied round and leant me shampoo, shower gel, straighteners etc so I could at least get clean. Airline gave me an emergency overnight kit with toothbrush, razor, t-shirt (too small for me though) I had to find a shop and buy a vest top so I could put on a clean top after my shower. No hope finding a bra in my size and very limited funds anyway. The next day, after we'd finished work for the day, everyone else went in the hotel pool. I sat on a sun lounger with my jeans rolled up, melting, wishing I was in the pool.
From now on, I will ALWAYS pack a change of underwear (or maybe two!) plus something to swim in, a toothbrush and mini toothpaste, clean top, shorts and mini shampoo, conditioner, shower gel and deodrant in my hand luggage. And a comb and some hair bobbles.
The relief when my luggage arrived-my god!