Wide shoulder strap on one side and a spaghetti strap on the other
Open side with stretch elastic bands. I measure seam-seam and double. I didn't stretch the fabric when measuring. It will stretch 2-3" or more. You can also stitch the bands to make them smaller, to fit your body
This big on my mannequin; the last picture is what it looks like on a person.
1st Strap 2nd 3rd 4th 5th
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1X - 42" 42" 44" 48 1/2" 52" Length 53"
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2X - 46" 46 1/2" 48" 52" 55" Length 53"
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3X - 50 1/2" 54" 54 1/2" 58" 63" Length 53"
Always use the measurements for each individual gown. Even the same style will run different due to the way the material takes the dye.