There's got to be a suitable collective noun for such an unruly collection of outdoors socks.
This website suggests that it's either "an odd number", "a stink" or "an oddnumber", but none of them fit the bill for my stash.
Other terms suggested to me so far are "a plethora", "a foot-fall" and the one I like best so far - "a march". If you've any others, feel free to let me know.
FWIW, here's my stash after I'd culled the duffers: