I got the jacket this afternoon. (I live in California, so shipping from RealReal in San Francisco only took two days.)
The measurements from RealReal were off a bit, as expected.
The Chest is 22.5 inches from Pit to pit, so 45 inches total (not 47).
The back shoulders are 20 inches with an outer arm of 25 inches for a total sleeve length of 35 or so inches.
Based on the QoS Harrington Project Sizing Chart the tan Harrington is closer to a Size 50 than a 52. Thanks to Rixon I found the size tag. My jacket is a labeled 52.
Yes, it fits. Trimmer than my size 52 QoS, but it fits quite well and looks great.
The jacket is stunning. It has the leather piping around the pockets as well as on the inside of the collar. There was no fabric tag on the inside pocket and no indication that there ever was a tag that was removed. There was a Tom Ford bag with extra buttons.
The Made in Italy tag has the word "Made" in green. Very odd. I wonder if this jacket was originally a production sample.
There isn't a mark on the jacket I could find. What looked like a mark on the inside in the RealReal picture turned out to be lint. 
Last edited by Westward_Drift (15th Jun 2019 05:10)