Many moons ago I worked for TWA, you would not BELIEVE what folks insisted would fit in an over head bin! (I swear to God sometimes they were like bodybags, with the pax INSISTING it would fit

) After years of non revving, I think that we have it down to a science, at least for our family.
When we go to the states - WDW, we each have a backpack, that fits under the seat, it contains a change of clothes, and a "ditty bag". We check one empty suitcase, that has inside another empty suitcase, and an empty duffle bag. Prior to travel, I pre pay for 3 checked bags (one each) on the return flight.
In August, when all of the summer sales are on, I shop Gap, Kohls, Old Navy, etc. and have everything shipped to the hotel. I love POFQ cuz it is not a convention hotel, and they do not charge to hold boxes. Bras, undies,
Crocs, shorts, t's, etc.
We arrive late afternoon, and when we return from the park the first day, bell services delivers everything (and we tip well - mousekeeping too, as they take away the empty boxes afterwards) And Voila! Clothes for the trip, and for home.
For our return, we fill the 2 suitcases and dufflebag that we have pre paid, check'em in and head out!
This saves us TIME, as I have no desire to waste a Disney Day shopping.
We dont have shops like these in Cozumel, or even on the mainland, so it is our way of clotheshopping!