Pattern is written for two separate gauges and encourages you to meet gauge with your yarn of choice. Size is finished measurement at the chest.

Gigantic (Super Bulky):
5 sts = 2 inches
7 rows = 2 inches

Heavy/Medium (Aran/Worsted):
5 sts = 1 inch
7 rows = 1 inch

Bear Brand, Fleisher Yarns Vol. 41: Gigantic Bulkies for Town and Country contains the super bulky version only, in sizes 34-36, 38-40, and 42-44.