Green’s Dictionary of Slang

heng-pon-nail n.

[W.I. pron. of SE hang upon a nail, whether in one’s house or in the shop]
(W.I.)

1. unpressed and bedraggled clothes; thus a term of abuse.

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[WI]L. Bennett ‘Cuss-Cuss’ in Jamaica Labrish 188: Goh wey, yuh fava heng-pon-nail, / Is me yuh want fe trace?

2. ready-made clothes, rather than individually tailored garments.

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[WI]M. Montague Dread Culture 33: Pointing to a woman in an old-fashioned dress, a man standing nearby joined in, ‘Ku heng-pon-nail, eh?’.