I saw a similar dress in a boutique and tried to make my own version of it (they were selling it for 180 euro...). It is made of 5 rectangles of fabric. From top to bottom: 1 row of rib knitted wool, 3 rows of wool gauze, and 1 row, under the last gauze row, made of double layer of white cotton. The last white row is suposed to be with no hem. Very very very easy, no pattern, just gathering of different sizes of rectangles (cost of the whole dress I made: 30 euro) The original dress was wider than mine, had more fabric, but I wasn't able to determin how much I needed, and it is ok anyway. It could be worn with a t-shirt underneath, with or without the straps. (the white cotton at the bottom comes from an old curtain) and as usual I don't know when or if I'll ever wear it...

rib knitted wool, wool gauze, white cotton