Yellow Polka Dot Bikini is a sport of Striptease. It changes both its center color and edge color during the season.
Registry - http://www.hostaregistrar.org/detail.php?id=7153&Variety=Yellow%20Polka%20Dot%20Bikini
MyHostas - http://myhostas.be/db/hostas/Yellow+Polka+Dot+Bikini
Hosta Library - http://www.hostalibrary.org/wxyz/yellow ... ikini.html
This flower picture is from a couple of seasons ago. It was a second flowering for this plant which is why it is so late in the season.