Oops, it doesn't look like 'dress each day' is a national day..

Other days

fiancee

Fiancee Day
polyamory

Polyamory Day
ask out your crush

Ask Out Your Crush Day
gum

Gum Day
kale

Kale Day
ormille

Ormille Day
self care

Self Care Day
bonang

Bonang Day
one

One Day
frozen yogurt

Frozen Yogurt Day