Suit rental for destination wedding

I agree with Hank, in many cases (it is for us) it is less expensive to purchase versus rent, have the discussion with your groomsmen and see if they are financially able to do so. In the end they have a suit they can wear again....

Typically the rental covers two days before the event and a return the day after the event but can be extended for circumstances like this (with a slight price increase as a result).

Any particular reason you need the groomsmen to rent instead of purchasing? If it's a cost factor, you can find a lot of suits at prices comparable to a rental.