You can get the Asian suits in a bit higher rise that would cover your butt entirely. See this Seobean.
The XL is probably slightly larger than the US MED
Keith1178 is a good vendor on ebay. He imports these from China but is in the US so they arrive in a few days. I'm sure if you have size questions he would help you.
http://www.ebay.com/itm/Seobean-New-...-/321884112020