I had a bad experience with an etsy vendor and decided to make my own Iron on Undies for the Groomsmen.
The idea is that the groomsmen will take a similar picture like this on the beach in Mexico!
I bought the undies off of Amazon. I got a 3 pack for $21 in gray and then I bought a pair of white for my fiance.
And I bought the Iron-on Letters from Create for Less:
It is really easy... Just peel off the letters and blast them with the iron for 30 seconds each.
I think they turned out great and a lot less than going through etsy. Plus, they are Calvin Klein and the etsy dealer gave me Fruit of the Loom!