From the tag, I believe this slip dates to the 1960's or 1970's.  Pit to bottom of lace hem is approximately 29".  The shoulder straps are adjustable. The color is more of an orange red that a ruby red.

Condition is used but there are no rips, holes, tears or stains.  It appears to have been rarely worn.  Enlarge and look at all photos for more details on condition, design and size.  Please contact if additional information or photos are needed.