In addition to their regular five and the Robinson jersey, the Mets also have a throwback jersey, an orange “Los Mets” jersey for Hispanic Heritage Night, and a different camouflage top for Memorial Day (though the players are no more or less difficult to find).
Update: it remains to be seen (I think, it’s early and I have only had one sip of coffee) what the annual “Stars and Stripes” design(s) bring. Last year there was the other camo jersey which you can see below.
