This is a stunning slip from 40 years ago

It might have been a night gown but it can be a dress

Size m but as it’s bias cut it can fit many sizes. I think 8 to 12 - the straps are very long and might need to be adjusted

Hard to measure as it’s bias cut but laying flat in the ground it’s 18” across at the chest and total length not counting straps (measured from top of bust to hem is 47”

There is a 16” tall slit on the side

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