Sago
When our son started boarding school, I sewed about 100 tapes on his uniform, home clothes, sports kit etc.
It was not my favourite task.
I had to do this recently when my mother went into a care home. Absolutely everything needed to be labelled.
Then I discovered that if I hadn't bothered, they would simply have put numbered 'tags' on everything (button-sized disks). In fact, I discovered that just before I dealt with her socks ,so those all have the tags on instead. That saved me a good few hours' work!
I have had a lot of experienced of hand sewing over the years, but even I found the woven labels a nightmare to sew through, even though they don't feel particularly thick.