We have the same issue when we have gone to Desire in the past. You would think for a nude vacation you wouldn't need much, but we end up with a large suitcase and carry on each. For our first trip to TTR we are only staying for 5 days so our plan is to pack only a carry on suitcase each. My big problem is shoes, so hubby usually will take a few pairs for me so I can take several. I think there are only 3 themes while we are there, so that makes it easier. But I am sure I will still want to bring lots of options which equals lots of suitcase space.
if you do it right, most of the swimsuits can be packed in your bubba mugs! Toss those in your backpack/carry-on for when you get there and you're good to go.