Darning A Sock
| Field | Clothing repair |
| Went Obsolete | |
| Made Obsolete By | Cheap mass production of textiles |
| Knowledge Assumed | Sewing |
| When useful | When unable to afford new socks; when hiking or otherwise near no sock shops |
Repairing holes in a sock via sewing.
Still useful for many people, it is not obsolete, though in western countries it is not financially efficient.