Posted By:
RobertSWhile I don't know their uniforms, here is a sampling of "Giants" teams from the Negro Leagues that I have found in "Only The Ball Was White" by Robert Peterson:
1920s:
--Chicago American Giants (Negro National League)
--Chicago Giants
--St. Louis Giants (Negro Ntnl. League)
--Brooklyn Royal Giants (Eastern Colored League)
--Bacharach Giants (Eastern Colored League)
--Lincoln Giants (Eastern Colored League)
--Harrisburg Giants (Eastern Colored League)
--Nashville Elite Giants (Negro National League)
1930s:
--Cole's American Giants (Chicago -- Negro National League)
--Columbus Elite Giants (Negro National League)
--Washington Elie Giants (Negro Natnl. League)
--Baltimore Elite Giants (Negro Ntnl. League)
Perhaps you can do some Internet searching on some of these names to see what you yield...
Hope this helps...