That jacket is actually a few hues brighter than navy, which, in addition to it being linen, makes it an ideal for warm weather. It’s unconstructed, partially-lined, has brown buttons and patch pockets, which can be seen better in this shot from a San Diego wedding last summer.
Unfortunately, I can’t recall the maker. Two summers ago, I ripped off the tag when trying to remove the dry cleaning tab. The inside care tag is in Italian. That said, here are several alternative linen jackets that I thought looked nice.