@closerfan12 - I think a size 8 is only made in a perle, which is about the same size as normal cotton thread, size 20, ie. very thin. I need my reading glasses and a strong light to work with it so I prefer size 10 much more. As for quality, the perle is lovely but I wouldn't say there is a great difference, I would go for a good price as it is all mercerize and therefore quality isn't really an issue.
@galen84basc - personally I wouldn't knit or crochet socks in 100% cotton as it has no stretch and when it gets wet, it can lose shape. Socks need yarn with memory to bounce back into shape with the heavy wear they receive. There are plenty of lace weight sock yarns out there which aren't much thicker. In fact, a lot are thinner than a size 3. If, however, you don't want wool in the socks, I'm just after crocheting a pair for my very allergic husband in Wendy Happy, silly name but beautiful yarn, it has bamboo and some sort of elastane percentage, I think, and it feels so beautiful and soft, you won't be disappointed, only that they may not stand up to lots of wear but there are patterns that allow you to double the yarn on toe and heel sections to make them stronger. Crystal Palace, Patons, Kollage all do non wool sock yarns and a few more, they're harder to come by but well worth it to have that blend in the cotton. Happy knitting -Jo