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Webster 1913 Edition

Noun.

The quality or state of being seemly: comeliness; propriety.

Noun.

[from seemly.] Comliness; grace; fitness; propriety; decency; decorum.

When seemliness combines with portliness. Camden.

seemliness ‎(countable and uncountable, plural seemlinesses)

(uncountable) The property of being seemly, appropriateness of conduct or behavior.
- 1919, W. Somerset Maugham, The Moon and Sixpence, ch. 10
  Her black dress, simple to austerity, suggested her bereaved condition, and I was innocently astonished that notwithstanding a real emotion she was able to dress the part she had to play according to her notions of seemliness.
(countable) The result or product of being seemly.

the property of being seemly