Don't think you have to hide under a muumuu when you go to bed.
These include a muumuu for women and a Hawaiian shirt and loose trousers for men.
A muumuu, which can be fitted and even sexy, as opposed to the voluminous garment that might be expected, is an excellent alternative, as is any dress boasting a Hawaiian print.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.