Shirtless crew..I guess this is normal?

[CaptainCox]

As far as I understand its both. Dirty work and warm weather.

; Hot Weather
;*************
CrewMemberBodyPart7= Hot, Headgear, #Normal, 0.5, NULL
CrewMemberBodyPart8= Hot, Headgear, NULL, 1, NULL
CrewMemberBodyPart9= Hot, Torso, bust_m02, 3, bust_md02.tga
CrewMemberBodyPart10= Hot, Torso, bust_m02, 3, bust_md02.tga
CrewMemberBodyPart11= Hot, Legs, #Normal, 1, #Normal

Work/Dirty
;*************
CrewMemberBodyPart22= Dirty, Headgear, NULL, 1, NULL
CrewMemberBodyPart23= Dirty, Torso, bust_m02, 3, bust_md02.tga
CrewMemberBodyPart24= Dirty, Torso, bust_m02, 3, bust_md02.tga
CrewMemberBodyPart25= Dirty, Legs, #Normal, 0.3, #Normal
CrewMemberBodyPart26= Dirty, Legs, pantaloni_m02, 1, pantaloni_md02.tga

What actually triggers that I am not 100% sure

I have never seen any bare breasted guys as of yet. But then again i am not checking the control room the whole time.