This is one of those cases where there are two hostas with the same name. Both of them are non-registered plant so, the name confusion will continue until one or the other is registered with The American Hosta Society. When, and if, that happens, the registered name will be the "official" one.

This cultivar shown above is of unidentified parentage and is a non-registered plant from John Kulpa of Michigan. It forms a medium size mound of rippled foliage that grows to about 16 inches in height with a spread of 49 inches. The leaves are convexly cupped and moderately corrugated with a thick bloom on the underside.

Hosta Helper will call this plant 'White Undies' (Kulpa)

.Another non-registered plant by the same name is from Carol Brashear of Connecticut. It is a sport of H. 'Undulata Albomarginata'and, According to The Hostapedia by Mark Zilis (2009), "...emerges as a bright, light yellowish white in the spring..."

Hosta Helper will call this plant 'White Undies' (Brashear)