Uncuffed chinos aplenty in Take Ivy and Japanese Ivy

I just got a copy of Take Ivy and am surprised at how most of the flat front pants are uncuffed. I've noticed this when looking at Asian interpretations of American trad as well, though Take Ivy highlighted ivy style in America albeit in the mid 60s. Were uncuffed no break chinos ever considered trad cannon at least from 1959 onward?

Uncuffed chinos aplenty in Take Ivy and Japanese Ivy