Suitable, a.
Capable of suiting; fitting; accordant; proper; becoming; agreeable; adapted; as, ornaments suitable to one's station; language suitable for the subject. -- Suit"a*ble*ness, n. -- Suit"a*bly, adv.
Syn. -- Proper; fitting; becoming; accordant; agreeable; competent; correspondent; compatible; consonant; congruous; consistent.
Shades of meaning
Fernald has no entry of its own for suitable; he lists it under adequate, becoming.
Where he writes about it:
Adapted, fit, suitable, and qualified refer to the qualities which match or suit the occasion. — from adequate
A clergyman may have strength adequate to the work of a porter; but that would not be a fit or suitable occupation for him. — from adequate
That is suitable which is adapted to the age, station, situation, and other circumstances of the wearer; coarse, heavy boots are suitable for farm-work; a juvenile style of dress is not suitable for an old lady. — from becoming
The dignity and gravity of a patriarch would not be becoming to a child; at a funeral lively, cheery sociability would not be decorous, while noisy hilarity would not be decent; sumptuous display would not be suitable for a poor person. — from becoming