I wouldn't know, mine is a large...sorry!
Sorry, my jacket is a size XL. I do feel they run a little small. I wear a large mostly but sometimes will need to bump up to an XL. It's a GREAT Jacket. My advise would be to call Sierra and ask them for the measurement. If that doesn't work, call Marmot and they will definitely give you the measurements.
Sorry I couldn't be more helpful.
According to Marmot an XXL fits chest 45-47, sleeve 34.5, waist 37.5-38.5, hip 48-49 but I would verify with them by calling 888 357 3262 or chat Mon-Fri 9AM - 5PM PT