Hi,
You have a great find there.
Although this style was 'in fashion' during the earlly 30's, my mother-in-law wore an identical one in saphire blue lace during her college days at UCLA in the earlly 40's. (o.k. she was a music major, not a fashionista).
Her dress came with a belt about 1" wide of the same lined lace fabric as the dress. It fastened with a rhinestone clasp. You still see those clasps around: an Art Deco set that hooks together to be a belt clasp, or can be separated into shoe buckles. (or made into a brooch, those girls really knew how to stretch a buck)
The lining is fume faded acetate (it has turned pink): the shape is bias cut with 1/4 inch wide straps.
I hope that helps you 'visualize' what your lace gown probably could use to really make a statement: a nice lace or satin belt with rhinestone Art Deco brooch to fasten it, and a matching bias cut lining. add strappy shoes, and WOW!
Have fun, wear gently, and keep it forever!
--Jennifer