Have a look at this link to our website. It details dry suit sizing for several suits/brands.
If you are looking to purchase one I would be more then happy to help you out with that as well. We have a pretty decent US price matching policy and I regularly ship drysuits to the states although we are based from Canada. You can view the drysuits we carry here!
Speaking from experience... your crew should be able to share an XL easily enough but then you are really favouring your big buddy on the sizing. In an ideal world your 6 foot 190 lb buddies would all wear a large and your larger friend would possibly get his own. I know sharing is ideal. But having a suit that doesn't fit right that is supposed to keep all the water out... won't always keep all the water out if the sizing is wrong.
Feel free to send me an email to email@example.com
and we can talk about it. Or you can give me a call toll - free at 1-866-955-0917
and we can talk more in depth about the suits and sort out the shipping method if you choose to purchase one. Advice is free
Shuswap Ski & Board