First. I wear a medium/large 12-14 shirt so the size 4-6 was not an option and the only other option was the 'large' that arrived with a tag saying it was lg/exlg/exexlg (or something like that).Second, wearing it in the pool weighs me down and the bottom of the 'shirt' floats up under my arms and the shirt arms are twice too wide and flop & make it hard to swim.Since I had tried it, the papers said it could not be returned, so I sewed about 3" off each arm seam and 4" off side seams of the 'shirt'. It's a bit better but body of shirt still floats up and still weighs me down. Actually it is a total failure. I'd like to return it and get my money back. I thought a 'swim shirt' would be made of lightweight, thin, stretch fabric, fit tight over my tight-fitting swimsuit and not cause a problem with swimming. I wanted something that would help keep me just a bit warmer during my workouts as colder weather is here now. What would you suggest? Is it possible to return it? Get a refund? Sorry.Eleanor