I confess...
JAB has a "Buy ONE, get TWO FREE" sale this weekend. I missed the Brooks Brothers June sale and needed real (not thrifted) shirts for an impending trip. I selected 2 Traveler Tailored Fit Twill Wrinkle Resistant Spread Collar Dress Shirts in white and 1 in light blue, 15 ½ / 34 . I arrived in sf approved garb and asked the assistant manager if I could try a shirt on before purchasing to see how slim the fit was on me (40S/30" waist). He glanced at what I was wearing and I could see him calculate his decision. He did insist on undoing the shirt himself, which was fine by me.
Three for $87.50

This shirt is not at the level of my thrifted BB non iron slim fit white dress shirt but it meets all of the criteria that I have decided on as being a best fit for me. ie: spread collar, shirt pocket (I need one, daily), split yoke, reasonably tailored slim fit, appropriately weighted fabric, yada yada.
This is definitely at the bottom end of sf approved shirting but I'll wait for the next BB sale now that I know what I want.