Kim pointed out that moss stitch and seed stitch are the same stitch. I always thought so as well, except that Norah defines the Moss Stitch in the pattern as:
Row 1 and 2: p1, k1 *
Row 3 and 4: k1, p1.

So, I googled moss vs seed stitch and according to Knitting on the Net the two are different.

Kelly asked about needle size. I didn't get stitch gauge with the recommended size 8 needle, in fact, I got it with size 9 needle. I am still not sure if I am getting row gauge for the Hex Coat which is important. Instead of ribbing on the bottom I proceeded with the moss stitch with the smaller needle size (in my case size 7). I am past the first identation for coat so I have to wait until the second indentation and then I will measure the length of each identation and count the rows and figure out where I am landing for row gauge and make necessary adjustments.