The perfect swaddle does exist
Our son will only tolerate these swaddles. He wiggles and fights in all the other ones we have. They have just the right amount of stretch and are nice and warm without being too hot for our Minnesota fall temperatures.
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is Perfect Fit and 2 is Runs Large