If anybody is looking to add a historical minor league uniform and logo to the ootp community's body of work... I would suggest the Des Moines minor league teams a worthy subject.
Des Moines, Iowa Minor League History - Baseball-Reference.com
There are good images online with a google search of the Bruins uniform. The Boosters uniform is probably period and basic, but photos are few online from what I can tell.
Many thanks to the community and the internets.
-- added -- an earlier Des Moines team was the Prohibitionists and there are a number of photos online of these guys. Simple left to right from our point of view D M logo.