A Digital Printing Network
Try http://www.kombat.com.au/ these guys are professionals at what they do and should be able to provide you with rugby shirts. I personally get stuff from these guys and are quite frank with what modern athletes are really after for performance.
We have used American Rugby Outfitters as a wholesale source for a women's rugby style shirt. The shirts came out great and our client was delighted. You can e-mail Conn@AmericanRugby.com or www.americanrugby.com and explain what you need. I also JUST saw one in a catalog but can't remember where. When the light bulb goes on, I'll post that too.
Thanks for the help!!
It took longer than I thought to remember who else had the rugby shirts ~ it's Charles River Apparel http://www.charlesriverapparel.com/classic-rugby-shirt.html