I have some leggings-style cotton shorts from Decathlon which I wear as biiiig knickers with dresses. What makes them particularly comfortable is that they've got a diamond-shaped gusset, unlike any other cotton leggings I've had. So I can wear them without actual knickers and not get a wedgie.
Can anyone recommend something similar?
I need them to have a high cotton content, mid-rise to high waist, 4-6" leg, size 16-20 (I'm usually an 18, but can vary).