Green’s Dictionary of Slang

(S.Afr.) the parading of an offender naked through a township as a form of punishment.

1990		M. Ndwandwe in Tribute Sept. 65: ‘Modelling’ was the practice whereby offenders would be forced to parade through the public streets naked while being stoned and beaten with sticks [DSAE].
1994		R.W. Johnson in London Rev. of Books 6 Jan. 10: Both sides operated ‘people’s courts’, dispensing summary justice, sometimes death, but more usually whippings or ‘modelling’, in which the guilty party has to strip naked and walk through the camp amid a crowd of jeering onlookers.