This is an oversized flowy top.  True to size in this top as shown below will be flowy enough to wear over leggings.  Size down one for flowy but true to size.

Fabric

95% Poly 5% Span

Size Chart

Small 2-6

Medium 8 -10/12

Large 12 -14

XLarge 16-18

Measurements:

From shoulder to bottom seam, size M has a length of 29 1/2  inches

Bust width on size M is 39  inches