Green’s Dictionary of Slang

neckinger n.

a cravat.

1590		A true recitall [...] of the death of Thomas Bales 6: [She] had nothing vpon her but a wide frocke downe to her foote, made of course canuas, gathered about the wristes, with an olde neckinger about her necke.
1597		T. Deloney Pleasant Hist. of Jacke Newberie (1633) ix K3: His Wife [...] would not foule her fingers, nor turne her head aside, for feare of hurting the set of her neckenger.
1652		Laughing Mercury 6-12 Oct. 115: Hans may ene draw his Sluices, or nooze himself in his Willow Neck-neckenger.
1864, 1867, 1870		Hotten Sl. Dict.
1886		N&Q Ser. 7 II 98: Neckinger is nothing more than neckerchief, but implies, I think, proximity to a place of execution.