Costlily

The assembly was wonderfully great; young Knights costlily armed and adorned, and Infantas who were King’s daughters, and Damsels of high degree, for whom their lovers were about to make pastime and pleasure.

Source: wiktionary

Scarcely had these movements been accomplished, ere a costlily arrayed knight appeared before them, and by the mouth of the squire who accompanied him, demanded admission.

Source: wiktionary

The newly arrived leader—Gonzelli—formed outwardly a complete contrast to the armed men about his brother, as well as to his brother also.—The latter was armed, and costlily.

Source: wiktionary

[…] during an early hour on a fine summer’s morn, a stranger costlily appareled, and accompanied by two mounted domestics, galloped violently, into a frontier town.

Source: wiktionary