underskirt

As nouns the difference between jupon and underskirt

is that jupon is a close-fitting sleeveless jacket, descending below the hips, worn over armour while underskirt is a skirt worn underneath another skirt; a petticoat.

As nouns the difference between overskirt and underskirt

is that overskirt is a skirt worn visibly, especially over another layer, such as a petticoat while underskirt is a skirt worn underneath another skirt; a petticoat.

As nouns the difference between underskirt and undershirt

is that underskirt is a skirt worn underneath another skirt; a petticoat while undershirt is an upper undergarment with no collar, and with short or no sleeves, worn next to the skin under a shirt; a singlet or (British) a vest.