Finally found a plain, black Skecher's flat that fit my foot and I'm excited LOL - after much trial and error the "Go Step Cheery" is exactly what I wanted to wear to at the office.  They remind me of men's "smoking slippers" with a nice sole, ultra go-go mat cushioning and a nice light suede finish that is non-binding around the foot.  They are super-lightweight.  The Skecher's sizing is what always gets me - I am a true 8 but ordered an 8 1/2 this time - they're slightly large in the heel, but I don't care - the memory foam will shape to my foot and keep them from slipping and with socks it won't be an issue.  Am serious when I say have ordered/returned over 5 different similar Skecher's styles and this is the first pair have been able to keep.  They're a great price, am going to order several more pair for next winter while they're in stock.