Definition of "tightum"

He knew that he had put out the usher's very best suit; not the tightum which he wore on Sundays; but the hightum, […]

1842, Mary Martha, Robert and Frederick‎

The second was of very respectable form and kind, and fitted for ordinary society; this she called "Titum."

1876, “Hightum, Titum, and Scrub!”, in The Leisure Hour‎

For one of Lucia's quaint ideas was to divide dresses into three classes, "Hightum," "Tightum" and "Scrub."

1920, E. F. Benson, Queen Lucia‎