**I do not know if a brand runs "small or large" Buyer must make this decision based on measurements given**
Some pilling of fabric
H&M Basic Black Sweater Dress is a size Medium
Ribbing on the bottom of sleeves and on the bottom of dress
Large scooped neckline 
Measurements are provided two ways: On dress form and laid flat
    
          On Dress form     Laid Flat

     Bust:         37"               19"
    Waist:        32.5"            16.5"
      Hips:        42"               20.5"

Length:   32.5" from top of back to hem