Most are dramatically thinner and more comfortable now (slight stretch, more tolerant of more temperatures, significantly softer and more flexible, etc). They'

Most are dramatically thinner and more comfortable now (slight stretch, more tolerant of more temperatures, significantly softer and more flexible, etc). They've become daily normal-comfort normal-fashion wear rather than work wear. Of course they aren't as durable on average - it's a completely different material at this point, sold for a different purpose. Durable stuff still exists, it's just harder to find because it shares the same name.