"Fun costumes" refers to clothing or outfits that are enjoyable or amusing to wear, often used for celebrations, dress-up parties, or events like Halloween. Full definition
This would be a really fun costume for anyone who is pregnant too! (lydialouise.com)
As dressing dogs up - either in fun costumes or functional yet fashionable clothing - gains traction, manufacturers are giving pet owners lots of stylish options and pet retailers profitable opportunities. (thepetaisle.com)
You can even have them come up with fun costumes to dance in or props to dance with such as scarves or a hat and cane. (breastfeedbabywearclothdiaper.com)