Under the guidance of fearless leader MMM :), I have converted to line-drying most of our clothes. (Is it weird that we now have a huge wall-mounted folding-frame clothesline, a small fold-up drying rack and a retractable line in the house, plus our existing dryer machine?)
Anyway, if anyone else line dries and needs to augment their supply of clothespins, an unusual but very good durable choice is actually "Clip-N-Weight" balloon clips, which are officially used for weighing down helium balloons sold at party stores and groceries, etc.
https://www.amazon.com/Premium-Balloon-Accessories-Primary-Clip-N-Weight/dp/B004R4HB84/https://www.amazon.com/Mayflower-11359-Pastel-Clip-Weight/dp/B004R4BU18/They go for about .15-.25 each if you shop Amazon. They are much wider than regular wooden clothespins, they have ridges to help grip the clothes, the spring works very smoothly, and they are lightweight. The big negative is that they are non-biodegradable plastic. When I get them for free from my parents, who LOVE celebrating holidays with balloon bouquets, they are a treat, but I feel guilty buying them new!
For environmental reasons I usually seek out the one-piece "Shaker clothespegs" (no spring, have a little round knob on the top). Vintage lots are easily found on eBay and Etsy; Penley and Diamond appear to have been some of the reputable American-made brands.