Keep in mind you can change the colours however you want. I'm using black because for me it looks the coolest. I presented three styles, one for light, more scout-ish type, one for a heavier, assault type and the return of the king, Cloaker Mk.2. Enjoy!
The pictures might look a little weird but you know how it is.

So, I presume if you use this one you're more of a sniper/smg user that just sits behind cover taking down enemies, covering the enforcers. I guess every type of player is useful in cooperation.

So let's get started with the items you will need.

Bottoms (w/ boots included) - Black battle pants, found under Battle Pants category, in Pants,
Top 1. - Charcoal T-Shirt, found in the T-Shirts category in Tops, duh,
Top 2. - Black Plate Carrier, found under the Utility Vests category in Tops,
Accesory 1. - Black Desert Scarf, found under the scarves category in accessories*,
Accesory 2. - Black Fingerless Gloves, found under the Gloves category in accessories,
Headwear - Black cap, found under the Baseball Caps, Forward category in the mask/hat shop.

Also it's kinda cool to have tattoos on your arms while playing /w this.

This style is dedicated to people like me, you know that type, moving in first, going in guns blazing, taking cover only to put another mag in. This outfit might be a bit more expensive than the first one, because it utilizes a heavier vest and a combat helmet.

Bottoms (w/ boots included) - Black Battle Pants,found under the Utility Pants tab,
Top 1. - Black Combat Sweater, found under Sweaters tab in Tops category,
Top 2. - Heavy Strike Vest, found under Utility Vests tab in Tops category,
Accesory 1. -Black Desert Scarf, found under Scarves tab in Accessories category,
Accesory 2. -Black Fingerless Gloves or Black Woolen Gloves, found under Accessories,
Facewear - Black Balaclava, found in the mask shop under Balaclavas tab,
Headgear - Black Dual/Quad Lens Helmet, found under Combat Helmets in the hat shop.

Here we go, the star of this show, coming back in a re-worked edition featuring cosmetic changes for that stealthy annoyment of your foes! You knew it needed to happen. Moving on, here's the list of stuff you'll need for this "beauty"

Footwear - Charcoal Tactical Boots, found under the Boots category,
Bottoms - Black Work Pants, found in the Pants category under Work Pants tab,
Top 1 - Black Combat Sweater found under the Sweaters category in Tops,
Top 2- Black Plate Carrier, found under the Utility Vests category in Tops,
Facewear - Skull Night Vision/Black Night Vision, found in Mask Store under Tactical tab,
Accessory - Black Tact. Gloves, found under the Gloves category in Accessories.

Well, this is the end, for now. I hope you enjoyed the new, actually edited guide and its content. I might add new outfits if I find any cool combinations. Now go, make me proud.

Last thing I have to say is, if you want fitting weapons and a sick ride, use any Mk.2 weapons in black tint and a black Kamacho.

Credits:
- RedLightPumpkin (ideas/screenshots/text/mastermind behind the guide)
- Merkurius (ideas/text/photoshop/assistance overall)