Purchased the large and am 5' 7" approx. 140 lbs. After washing and ironing the hemline hits just below the knee.
It's not the very best fabric for hot humid weather, but it'll do since it is loose fitting.
The unusual design is a plus.
Update -  received the beige dress (previously ordered the green dress), washed it on gentle cycle and gentle spin prior to wearing it. The serge stitching detached in many areas leaving the loose weave linen frayed. Am in the process of stitching these areas and not confident this dress will last beyond a couple of washings.
Update 30 Jun 18 - received an email from Mordenmiss stating I've purchased several items from them and asked for pictures of the problem areas of the garment in order to improve QC. The pictures have been sent. I am glad to help them with QC and was offered a replacement garment and they requested I update the review. Replied I will update the review when a replacement is received.
Update 11 Jul 18 - the green dress now has two places where the fabric is fraying - on the neckline and corner of a pocket. The fabric's weave is somewhat loose, however over the years have owned many linen garments and none have frayed although linen tends to have  a looser weave than most fabrics. The photos show attempts to shore up (using pink thread) the fraying and hole near the pocket.
I've only washed these garments on gentle cycle with 400 rpm spin. It's doubtful this method causes the garments to fray.
Update 01 Aug 18 - A new dress was received from Mordenmiss. Customer service is fairly good although it seems they use google translate to communicate. I've also attached a picture of fraying material around the patch pocket from the green dress (same design) also purchased. I will be leaving a review of another Mordenmiss dress I bought that now has a hole in the underarm seam. It's been washed on gentle cycle about a dozen times. No more Mordenmiss!