Look into
http://www.andreascahling.com/mens-posing-suits.aspx or Google Jelly Swimwear. Both have been great for me for many years. Jelly swimsuit are women's bikini bottoms, but are stretchy in the front for the comfort and fit for any size guy. I like the very narrow sides and the American and the Euro bottoms. Gives a great tan and receive a lot of compliments from the girls.