So, I love the style... and I fit in all the other Size 20 dungarees - but these?
I wouldn't recommend getting these if you're even a *sniff* over their range for Size 20.
I *squeezed* into these and... the result isn't flattering.
Even in a regular leg length, they're a good 3-4 inches too long. And I wear a regular leg!
It looks like it's been cut to fit someone up to about the average size 14, then just sized up, rather than recut for 16, 18s and 20s. It doesn't have the give or width you'd need at the upper end of sizing range where you need it.
They'll suit plenty of people if you're not 18-20 and don't have a lot of butt or hip, I reckon.