Hey there! Founder of BGSU Quidditch and current IT Director for the IQA. I really really loved the orange checker design. But for historical context when I originally had to get uniforms black was by far the easiest thing to get online, especially since the vast majority of the brown I found wasn't accurate to our school's colors (and looked like crap), and most of us really didn't want to be the "weird kids" playing a new sport and wearing brown.
Anywho, our mascot the Falcons have been really important to the team over the years, did you have thoughts on incorporating that? Also, our school's fight song is titled Ay Ziggy, you've probably heard BG Quidditch sing it before games. It might be cool to include that in the jersey, maybe similar to how the football team did it a few years back