Don't get me wrong, I love the half life series and the cosmetics look good. But there's already a cosmetic set in a similar style to this that has already been added to the game. The Free Mann's Fashion and the Hazardous Environment Vest. Here are the links to the cosmetics respectively and the set included.

Free Mann's Fashion: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3162386060
Hazardous Environment Vest: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3162380234
Questionable Ethics (Item Set) https://steamhost.cn/steamcommunity_com/workshop/filedetails/?id=3162458482

I don't mean to come off rude or anything, I just think that valve would probably not add this in because a similar cosmetic already exists. Thank you, and have a good time.