bootie

bootie noun
or chiefly British bootee /ˈbuːti/
plural booties or bootees
bootie
noun
or chiefly British bootee /ˈbuːti/
plural booties or bootees
Britannica Dictionary definition of BOOTIE
[count]
1 
: a short and thick sock for a baby
2 
: a sock, slipper, or boot that covers the foot and ankle
3 
: 2booty