The "Echelon" outfit in PAYDAY 3 is a reward for having attained infamy XXV in PAYDAY 2.

Here's how the outfit looked in PAYDAY 2 (where it was named "Legacy Tactical"):

And here's how it looks in PAYDAY 3 - considerably paler and with a white t-shirt:

It'd be cool to have a mod which makes the PAYDAY 3 outfit look more like the PAYDAY 2 variant.