In hosiery, "denier" measures thickness. A standard pantyhose might be 10-20 denier. A heavy winter nylon might be 40-60. is unusually high. This suggests "107" refers to a gauge (needles per inch) or a specific blend code. A "107" nylon would be incredibly opaque, warm, and durable—more like a tights fabric than a sheer stocking.
: Hand washing in cool water with a mild detergent is generally recommended to prevent snagging and maintain elasticity. SISU & FINN ala nylons forum 107 high quality
Draft a more on the history of nylon manufacturing. Let me know which direction you'd like to take! Ala Nylons Forum 107 - Google Groups In hosiery, "denier" measures thickness