New with tags. 

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APPROXIMATE measurements:

Armpit to armpit 13 1/2"" across laying flat

Waist is 10 1/2" across laying flat but can stretch to 12"

The FULL LENGTH of the dress from the  top of the shoulder to bottom hemline is 29" long

The SIDES of the dress from armpit to bottom hemline is 22" long

Arm opening is 6 1/2" wide laying flat

Shoulder straps are 5" long 

The TOP PART of the dress from between the chest down to the waist is 10" long

The BOTTOM SKIRT part from waist to bottom hemline is 11" long