There's a Roman sock illustrated in Anthony Birley's 'Garrison Life at
Vindolanda,' Tempus 2002. Can't quite make out the exact placing of the
seams, but the text says that two pieces of cloth were roughly tacked
together. Then there's a knitted sock illustrated in A T Croom's 'Roman
Clothing and Fashion,' Tempus 2000, plus refs to cloth-made socks.