The most common tops here were Hibs,Hearts and the now defunct old firm. I know a lot of Celtic supporters who do not buy their children tops due to the animosity they attract from bigots. Sevco support are boycotting Mike Ashley so not many tops to be seen. I suspect a lot of parents will be like the Celtic families I know.
What you do see now is a lot of foreign tops. Didn't get that back in the day.