I did, and like I wrote, they did not have what I was seeking. I desire a classic button down oxford cloth shirt. That means the collar buttons down. Not the misused term of today where button down means it has buttons down the front. They have no option for that. There is no option for the back of the shirt. There is no option for a locker hook, fruit loop, or whatever you want to call it. Even when I put in oxford cloth as the fabric, they do not have the colors I want.
Select the ‘Custom’ tab on the main page, then ‘Custom Shirts’. Once you’re there select ‘oxford’ in the fabric weave options. Then choose the rest of the construction details — collar style including button down, rear pleat style including center box pleat with or without locker loop, placket style/width, cuff styles, pocket styles, button materials and stitching, etc. And of course you can specify the measurements. In the advanced options you can choose things like the amount of shoulder slope.
https://www.spierandmackay.com/Fabric
If you’re pretty serious about oxford shirts you might also check out Kamakura in Japan. They’re obsessive about getting the classic oxford details right:
https://kamakurashirts.com/collections/sport