I do that. When I came back from our October trip, after being to Disney for a grand total of 43 days out of the last year, I folded away my "Disney Only' items (fanny pack, lanyards, trader pins, etc) into my 'Disney suitcase' and it was so blitheringly sad!!!
We do buy new tee-shirts and stuff and bring them with us (I don't know WHAT it is with my husband and new underwear before he travels, but there it is too...) so when I come across the stuff throughout the year I'll think "Oh, cool! I wore that when we were..." and remember...
It's a great feeling.
