I had paper knickers too - for the same reason!
I saw them on sale in the hospital shop a couple of years ago, but only in one size - aeroplane size. I asked if they could get other sizes. "That's a good idea. I'll look into it."
They also had them in the hospital, in a selection of sizes, but for their use, not ours. Worth investigating!
I appreciate people who are civil, whether they mean it or not. I think: Be civil. Do not cherish your opinion over my feelings. There's a vanity to candor that isn't really worth it. Be kind. ~ Richard Greenberg