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to wear trousers with no underpants There isn't time to dress properly - we'll have to go commando.
go commandoand go freeball(ing)
in. [for a male] to go about not wearing underpants. (The same as freeball.) Bobby is always going commando. Even when it’s cold.
See go commando
See also: freeballing
To wear clothing without wearing undergarments, especially underpants.