Newly-crowned Formula E season four champion Jean-Eric Vergne and his Techeetah team-mate Andre Lotterer were fined for wearing non-compliant underwear during qualifying for the season finale in New York.
Both drivers were fined €5000 and given two penalty points for breaching article 30.14 of the 2017/2018 FE sporting regulations during qualifying for the second race of the double-header at the Brooklyn circuit.
"After checking the clothes, helmet and front head restraint of the driver it was found that he was wearing non-compliant underwear pants which are not allowed by the [FIA's] international sporting code," read a bulletin distributed by the governing body and announcing Vergne's penalty.
"The driver apologised. The stewards consider that in this case the infringement occurred during group qualifying with limited cars on circuit for a short period of time."
Lotterer's underwear offence occurred during the superpole running ahead of race two, where he equalled his best FE qualifying result with second place on the grid behind polesitter Sebastien Buemi of Renault e.dams.
This is not the first instance of an FE driver being punished for wearing non-compliant underwear this season.
At the Punta del Este round in March, Audi driver Lucas di Grassi was also found to be guilty of the same transgression.
But the 2016/17 FE title winner was fined €10,000 and given three penalty points in that instance.