Shirt for jumpers?

Hi all-
I'm doing jumpers for the first time this weekend. I've been showing hunters and equitation for a while, but jumpers is somewhat new to me. Anyway, my question is, what kind of shirt is typically worn for jumpers?
The show I'm going to is a schooling show, so technically I can wear whatever I want to, so definitely no jacket or anything. I would wear a polo, but the weather's going to be a bit chilly so I need some sort of long-sleeve or jacket that still looks like show attire.
The rest of my outfit is pretty typical- tan breeches, black tall boots, belt...


So, in short, what shirt would be typical show attire for a schooling show in cooler weather? Links would be appreciated!

Thanks!

When I show jumpers in the winter, I wear a long-sleeved white or black shirt (underarmor-type and warm) with a polo on top.
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Iv'e worn a polo with a cable knit sweater over the top in the jumpers for cooler weather...but you will be ok wearing anything really.

This. Either a polo or even a show shirt with a nice fitted sweater over. A fitted long sleeved shirt layered under a polo should be ok for a schooling show, but I've always thought the sweater was classier.

PS- way to enter "the dark side".... ;) good luck!