ViCherubThermal Underwear Set for Women Long Johns Fleece Lined Base Layer Soft Top Bottom

For those who have product, are the pants thin enough to wear under jeans and/or leggings? If between sizes, should I size up for use as a base layer?

What is the inseam length?

Do these have a gusseted crotch?

Are these like compression thermals? I hate being squeezed really tight.