From Grainline:
A great basic top for spring and summer which does double duty as a layering piece in the fall and winter. This top features a tiny pocket as well as bust darts and a slightly relaxed fit. Suitable for many fabrics, dress it down for day in cotton chambray or make it fancy with a printed silk.
Techniques involved include straight seams, darts, and applying bias facing.
Please note: The Tiny Pocket Tank has been discontinued - see the Willow Tank & Dress