I remember the "plus fours" of my misspent childhood. "knickers" was the name of undergarments my sister wore .

I would certainly hesitate as they would likely be too short. The Plus-fours came down over the knee, and then had a cuff that went under the top of the stocking, as I remember it. (Of course that was more than 60 years ago.)

A much better (and cheaper) alternative are the Soccer hose, but they do not come in the argyle pattern to the best of my knowledge.