To "Wrestling Poet"
I do not understand clearly what you mean in your message about the jockstrap
first of all what grade was "prep school" 1970's
So you had a weekly gym package given by the school which included a towel, a jockstrap and a tee-shirt and you had to buy by yourself socks and gym shorts and to wash them while the tee-shirt,the towel and the jockstraps were as changed each week ?
You said that it was a guy ( student ) who gave you the package but you are wondering how he could know your size to choose the good jockstrap.
You said that you have seen a photo where a line of guys in jockstraps are waiting to receive their gym supplies but in your case the jockstraps were in the package so you could not wear before receiving it a jockstrap at your school
so for you it was different but you say that it was how the line looks like ? your line or that of the photo?
What I do not understand is how you were dressed on the first day : were you in underwear,or naked ?
It is not clear because you said that you had to show up, then to undress in underwear, then get your weigh and heigh measured and then pick up whats sport equipment you needed.
but after at the end of the message you said that "underwears were not worn on this line
so when you were in line for being weighted and heighted and for receiving your gym package, were you wearing an underwear or stark naked ?
You seem to explain that you were naked because it was an all boys school and , it tooks place in the gym, was it right ?