H&M Basic Tank Sleeveless Knee Length Dress Black Size Small

H&M Basic Tank Sleeveless Knee Length Dress Size S - Size Small - Not sure what fabric is but it is super soft, flow-y and drape-y - Armpit to armpit is 18+" when flat but super stretchy - Long-waisted (compared to other H&M dresses I've worn???) Waistband is elastic and sits approx 19" from top of shoulder - Length from top of shoulder to bottom hem approx 38" (sits just above my knee, I'm 5'6") - Black with White Dots - Lightweight but not see-through