The quality of being stylish or fashionable.
Stylishnesses is usually seen as a good thing because it means someone or something looks good and modern.
Examples:
Her stylishnesses always impresses everyone at the party.
The stylishnesses of his outfit caught everyone's attention.
I wish I had her stylishnesses.
The cat's stylishnesses in the hat made everyone laugh.
His stylishnesses is so amazing, it's like he's from the future.
The stylishnesses of the car made it look like a spaceship.