You should get a needle and thread and try doing it yourself! I'm serious. Iron it down straight as a ruler, do a temp running stitch down to make sure you got everything in a line, and then backstitch that sucker down.
Gutted I missed the Leopard print Gitman x Tres Bien shirt. I emailed them as soon as they sent the email out yesterday for sizing advice since it mentioned slim fit, and my OC x Gitman in medium is a little snug. By the time they responded today, all the M's and L's were gone.
If anyone grabbed one and is willing to sell and/or decides against keeping it, please let me know. I'd be forever grateful.