That is a style of clothing called “roughies.” Worn by civil affairs/others. It is well known, world wide. Either they’re idiots that have to- or camo’d for the idiots.
I’ve never heard of “roughies,” but this looks to me like the basic LLBean classy casual outfit. Go to any outdoorsy event and half the men there will be dressed this way. The other half will be in jeans and sweatshirts. Exactly what an undercover guy would wear to blend in. Of course, they should take care not to wear exactly the same combination.