I guess the most typical zipper us guys contend with is the pant zipper which we have to operate many times a day (depending on fluid consumption etc.). and this zipper is ALWAYS on the right. So I can see why all of a sudden having to zip on the left side would be awkward.
On slacks and jeans I can't tell which side the car is on. It is just a straight up and down, because it is attached at the bottom.
A jacket is different, where you have to put the bottom together and the car is either definitively on the left side or the right side.
Possibly men have a problem with small-motor coordination and it makes a big difference to them whether they slide the zipper into the car from the left or the right. That is why I have asked this particular audience for your input on whether it is easier for you to put a zipper together when the car is on the right or on the left.
Please try to cooperate in this survey.
