Augusto jackets are great but after trying one on and recalling the conversation about single/double vents, I think you should offer with vent.
To add, off the rack I still saw areas where I needed to visit an alteration tailor to get the jacket to fit better (across the upper back). And I just kept thinking:
Between a ventless and vented jacket, I feel like a jacket with back vent would still be more versatile
Even for casual wear or the style you are imagining,...