convict haircut

[moonlike]

Hi
Could you kindly help me with the meaning of "convict haircut" here?
Who said that all the men in the world should wear drab grey suits and convict haircuts?
Thanks a million.

 

[Rover_KE]

A convict is a prisoner in jail. They used to have their hair very closely-cropped.

Rover

 

[SoothingDave]

To prevent lice.