Question: how to french roll jeans?
Answer: Start with normal, unrolled jeans.
Pinch up the inner hem of one leg, lengthwise. ... 
Fold this pinched fabric flat over toward the heel of foot. ... 
Hold the foldover in place as you roll the bottom hem of your pants up once, 1-2″.
Roll that bottom fold one more time so the hem is no longer visible.
Repeat on other leg.