I own this jacket. It is a hopsack weave so therefore comfortable in warmer weather. It is my summer/spring blue jacket.I am looking for a solid navy blazer I can wear just about all year. I found the following and suitsupply said it was 13.8 oz.
http://us.suitsupply.com/en_US/jackets/havana-navy-plain/C1005I.html?cgid=Jackets
Since it is half canvassed and unstructured, even with the heavier weight, could this be a spring/summer jacket as well?