Mel,
I always wear my 'house shoes', comfy slippers - alla time!
I've tried a lot of 'em and most aren't to my liking,
or if they are- they fall off without my noticing.
I've settled on a glove-leather-soft moccasin, with a pillow-like soft insole.
I got them for Xmas 2 yrs ago and have been repairing the flexible rubber soles with 'Shoe Goop' (BTW-Great Stuff!) for the last 6 mos. cause I can't find a pair in size 13 to replace them, either!
But a moccasin style is the best for not falling off
(as long as you don't ruin them by bending the backs down to let them slip on & off like 'Crocs').