Have I ever tried side-zip pants? Oh yes, I grew up in them. Side-zip pants were common for women and girls until around 1970. I remember when some girls, around 1970, turned up in front-zip pants. Several parents and teachers were almost chocked, as the front zip was considered a "mannish" look. But we all soon got used to it. Suddenly, "everybody" wore front-zip pants, and side-zip pants were considered dated.
In the mid 70s, there were even back-zip pants. After visiting "the rest room," people would often forget about their open back zips, so walking behind other people in those days could be rather fascinating ...
Anyway, side-zip pants can be very flattering.