Completely ignore the Gerry Davis Signature Shirts by Cliff Keen. They are everything you don't want: They run small; they don't breathe; the fabric doesn't give. I own many brands and colors and these are the absolute worst--even worse than the first-generation Official's Choice. And everything at Gerry Davis is as high-priced as Honig's--another reason to steer clear.
Purchase Official's Supplies is definitely another outstanding outfit to add to the general list of umpire supply sites. Unimpressive web site, but very professional guys.
But the shirt that you described is basically the Dalco--if you want a quality loose-fitting, professional-looking, breathable mesh--or Official's Choice, if you want poorly-made rookie gear from a company that's becoming the laughingstock of the industry ... one umpire at a time.
Dalco is available at
Ump-attire.com and
Between the Lines. You can't go wrong with either of those sites, whose owners are as personal and professional as the P.O.S. guys. (But P.O.S. is phasing out Dalco. They feature Smitty's, which, after you get over the name, is the most comfortable, best-fitting and best value of the medium-weight closed mesh, which is not what you're after.)
Go to Jim Kirk at
Ump-attire.com and try the Dalco.