The quality of being suitable or appropriate for a particular person, place, or situation.
Suability is a good thing. It means something fits well or is just right for a certain person or place.
Examples:
The suability of the new shoes is perfect for my feet.
The suability of the music for the party was just right.
The suability of the book for the children was very good.
The suability of the hat for the cat was very funny.
The suability of the bed for the elephant was amazing.
The suability of the costume for the play was just perfect.