It makes me smile! The fabric is lovely, quirky and comfortable. And, it fits!
For the button placement, I simply put a pin at the bust point and measured the distance from the collar band center to the pin. I split the difference (4") and used that amount to distribute the rest of the buttons.
Before sewing, I did not trim the collar and stand pieces. I used the 5/8" seam allowances given. No problems. The pattern pieces for this shirt all matched up well and the sleeves eased in like they should. There will be more shirts in my future!