Shawlette is worked from the top down, starting from the center back neck. Length can be added in multiples of 3 rows (a multiple of 3 ch-3 sps is needed in each section for edging), additional yarn may be required for additional length.
When working stripes in B, you can either cut A and rejoin at the end of the B row, or carry A up the side and work the next row of A in the same direction as the stripe in B (i.e. 2 WS or RS rows in a row). Shawlette is reversible with no true WS or RS.