unblouse

listen to the pronunciation of unblouse
Английский Язык - Английский Язык
To untuck (leggings from footwear); to make (pants or trousers) unrestricted or untightened at the ankle, often as a sign of rank or service

In front of the entire regiment, the condemned trooper was forced to unblouse his trousers, remove his airborne boots, and replace them with regular shoes.