This morning, when I dropped off my shirts at the dry-cleaner, the staff told me that the price is higher in the summer. Out of curiosity, I asked her why. She said it appeared that the volume always goes up every summer for some unknown reason and thus they can charge more. With some pondering, I suggest the following possible reasons:
1) Perhaps people can’t hide their “dirty” shirts under the sweaters/jumpers in the summer.
2) For personal hygienic reason (sweat and such), there is more of a need to change your shirt more often.
3) It is vacation time in the summer. People tend to have less time to take care of their own shirt cleaning.