Isn't it like a specific day or week, maybe same day that companies/schools do/allow uniform change for summer wear? I'm guessing just before then is a good time to buy stuff in sales :)
I bought a new set of dresses to rearrange my wardrope, whats the place in tokyo to sell old dresses,
welcome ideas of donating to charity, but need english communication :)[...]
I've seen in izakayas and restaurants, but not in supermarkets or konbinis. I'd like to buy for my friend as a present.