Reformation flax linen shift dress size 10/12?

Beautiful unworn Reformation linen/flax color sundress Size tag is missing. I wear a 10 or 12 I. reformation and it fits me. See measurements all lying flat. 18” bust 16” waist 42” length from bust to hem, 20” hip Lots of stretch on the bodice from gathered/elastic smocked back detail. Gives a custom for. Front slithers a little playfulness to a classic.