paSlogh is an inherently plural noun, grammatically singular.  tu'mI' the word for one sock.  The usual way to say "pair of socks" is paSlogh chang'eng; tu'mI' chang'eng is odd, but if you said it, you'd be understood.

qoch is not the word for "partner" when referring to socks and gloves and the like.  The word for that is nelwI'.  With nel, the subject is one sock (or glove or shoe or whatever) of the pair and the object is the other.  To talk about a sock (or glove) matching (that is fitting onto) a foot (or hand), use the verb mey:

        mumey waqmeywIj "my shoes fit" (literally, "my shoes fit me")

        torgh lumey waqmey  "the shoes fit Torg"

        waqmeywIj vImey  "I fit my shoes" 

SEE ALSO:

waq shoe (n)
DaS boot (n)
DaSpu' boot spike (n)
qam foot (n)
mov top of foot (n)
bem sole (of foot) (n)
yaD toe (n)
va'nuch heel (n)
'uS leg (n)