noun.
The state or quality of being suitable, adapted or accommodated; suitability; fitness; propriety; agreeableness.
noun.
The result of being suitable.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the quality of having the properties that are right for a specific purpose
Word Usage
"My head of department sometimes makes neutral or complimentary comments on my clothes suitableness of shirt colour, that kind of thing and I find it, not exactly inappropriate, but a bit odd."