Appropriate; suitable for the circumstances.
(of a person) Having a suitable conformity to basic moral standards; showing integrity, fairness, or other characteristics associated with moral uprightness.
Sufficiently clothed or dressed to be seen.
Are you decent? May I come in?
Fair; good enough; okay.
He's a decent saxophonist, but probably not good enough to make a career of it.
Significant; substantial.
There are a decent number of references out there, if you can find them.
Comely; shapely; well-formed.