I've been buying since around January for our June trip. I made out a master list of all toiletries, food, swim stuff, themes for clothes (safari for AK day, Princess for our PSB breakfast. I have everything for the kids, clothes hairbows , shoes, all the toletries, but bery little clothes wise for DH and myself. I'm also trying pretty unsuccessfully to lose weight, so I don't want to buy alot until I see what size I'm in. And DH works outside and manges to ruin almost ALL the clothes I buy him, so Im waiting until the last minute minute to get his. I bought alot of Disney stuff for the girls Easter basket, and I also bought crayons, notebookes, pencils, coloring books and a small tote bag for ewach full of travel stuff as a surprise the morning of our trip.
And almost all of it was bought just for the trip. Now, I do buy off the clearance rack and at the consignment store so the actual cost really wasn't that bad. But to me, you want the kids to waer nice comfortable matching clothes and if you don't put them up, they'll be destroyed long before yuor trip. Besides, it's not really a vacation if you don't have cool new stuff to take with you !