i had a hard time finding the right color also - because of the huge variety of colors on cloth ^^ and also because US and Europe use diffrent Color-palette Systems
(
https://www.facebook.com/media/set/?set=a.287434801414976.1073741836.272134726278317&type=3 ) for more
For Pants and Jacket i used a Blue-Collar workers combination in RAL 5000 "Kornblau" (cornblue) it's a standard color for Working-clothes in germany and a bit lighter in blue then the UK or US Overalls i found out.
to get the Elbow tight i figured out using a tight Under-Armor-like shirt would work.... but of course the Colortone "Kornblau" is not avaible cause those shirts wont get tailored in germany - but the Color "Ryl" came very close maybe you can work with that Info.
Vest: Dark Marineblue Leather
Belt: My first Suit used some Faux-leather in a "cappucino"-light brown (
https://fbcdn-sphotos-d-a.akamaihd....1.0-8/1617439_287453254746464_249857131_o.jpg ) But later i made a new one just out of natural Brown Leather.
even though the color variation i cant say exaclty which looks more "right" but i tend for the darker Leather.
Gloves: In the show it is shown that they have the same color like the rest of the Suit. But if you cant sew it yourself the chances are very low to find a right tone.
I used blue/grey Leathergloves from the fed.Army which was cheap and fitted in the color-palette.
For Season 4:
The Season 2 Grunt gets alot apperance in the background because the animators needed to fill the crowd. So they bleached and rugged the suit and put alot of dirt on it ^^
The other new Grunts of Deathwatch are either in Black-suits bleached out. Or in darkgrey suit with alot dirt XD
except the supercommando-Grunts. They are all Black and bleached. XD