This is a lightweight vest, and its "formal" aspect cannot be disguised. This is somewhat different from the Gioberti tweed style fabrics, which can pass as informal depending on what they're worn with.

I had to iron this a little after receiving it, but that was successful.

Don't overlook the five button feature. This makes for a better look and fit.

I own more than five of the Gioberti vests.  This one isn't my favorite, but it's well worth owning. They are an excellent value.