the most expensive dog coat turns out to be the easiest pattern to copy, just traced.

to fit Harvey this is 12.5 inches wide, 11.5 inches back to neck, 17 inches back to end of each tab

Method: use pattern to cut two fabric shapes and a 23 inch long four inch wide strip. Quilt wadding to the reverse of one shape then sew shapes wrong side together, leaving a gap to turn. Top stitch the edge, this also seals the turning gap. Iron the strip in half then turn in each edge to make a four ply strip . Top stitch along each edge and fix as on pattern.

once checked on doggie for fit,  affix Velcro tabs on neck and on strip. Now just waiting for the reflective tape to arrive, so his night time walks are warm and safe.