Armie Hammer at SXSW

Armie Hammer wore this slim notch-lapel, one-button suit with three patch pockets at South by Southwest. 

David Oyelowo at 2017 Spirit Awards

David Oyelowo wore this one-button, shawl-lapel suit to the 2017 Spirit Awards.  Make no mistake: this is not a tuxedo; this is a business suit.  The one-button, shawl-lapel suit was a 1960's trend that unfortunately never really caught on.  It's the most simply elegant of all suit styles, especially with a low button stance as worn here. 

Dan Stevens at the 'Beauty and the Beast' London Premiere

Check out the button-one, single-breasted, peak-lapel, navy suit that Dan Stevens wore to the 'Beauty and the Beast' London Premiere.  I agree with Tom + Lorenzo that his look is bland, but it would be even more bland if the suit was a button-two.

New Anthony Sinclair Suit

In his latest post, Matt Spaiser of The Suits of James Bond showcases the button one suit he just had specially made from Mason & Sons, heir to the name of Anthony Sinclair, who was Sean Connery's tailor during his tenure as Bond. 

Gray Blazer

Front button style: button two

Button stance: classic (buttons at natural waist)

Jacket length: slightly short

Sleeve length: classic

Front darts: yes (slight waist suppression)
Color: medium gray

Lapel width: slightly wider than classic
Lapel edge: swelled
Lapel style: notch
Notch height: slightly high (but not high by today's standards)

Jetted or patch pockets: patch
Flapped or flapless: flapped
Flap height: classic

Cuff button style: button one

Vent style: single
Vent height: deep (11"; classic height is 8-10")

Shoulder: moderately padded and extended 

A Southern California chain that went out of business in 1991, so the blazer can't be any newer than that.

Age verdict: late-1960's (or very early 1970's), for 3 primary reasons:

1) the late 60's were a transitional period between the thin lapels of the early-mid-60's and the wide lapels of the 70's;
2) Deep vents started becoming popular in the late 60's;
3) Although the button one front reached its apex of popularity in the mid-60's, the button one cuff remained stylish for a couple years thereafter, even on button two and three fronts. 

Tomorrow Never Dies

Check out the most recent post on my favorite blog, The Suits of James Bond, about the button one suit worn by the henchman Stamper in the 1997 James Bond film, Tomorrow Never Dies.  Although in my personal opinion, the suit’s cons outweigh its pros, it’s noteworthy for two reasons: its undeniable uniqueness, and its suitability to the character.  Kudos to costume designer Lindy Hemming for putting so much thought into the suit of a minor Bond villain. 

Mary Tyler Moore and Dick Van Dyke

In honor of Mary Tyler Moore, who died this week at age 80, yesterday's post on one my favorite blogs, Ivy Style, showcased various 1960's styles worn on The Dick Van Dyke Show, including the button one suit.