Moss Stich jacket yarn?

Hello I am trying to make a moss stich jacket from a patten that has an odd wall that has been discontinued I belive.

The tension square is 18 st 28 rows in moss stich do you think that this is DK ?

Your help would be greatly appreciated

If you have a link it would be helpful. There are a lot of patterns out there.

18 sts over 4 inches is usually worsted weight in stockinette. Not sure how much difference it makes in moss.
http://www.craftyarncouncil.com/weight.html

What do you mean “odd wall”?