Yeah. I believe I could help with this.
I currently adhere mostly to a personal group of measurements that I have assembled using a mash of Lori A. Knowles “Patternmaking for Fashion Designers” and some current ASTM measurements. There’s obviously some differentiation, however many of the measurement names can be cross referenced (although the values and exact names are not always the same).
Ultimately, I found Lori A. Knowles Pattern making books to be very helpful when learning pattern drafting, and it’s suited me well over the years. I’ve created my own workflow that diverges slightly from her methods, but overall her system is what I like to use.
I do design for production though, so for my most recent measurement file(s) I used mostly ASTM measurement values plugged into existing Seamly names. And then for custom clients, I alter this file and enter the clients individual measurements (as opposed to using the ASTM value).
I don’t really have an issue with most of the names for measurements found in Seamly. But as you stated there is no set standard, so it can be confusing to see different names for the same value (or similar names with different ways of coming about at the value).
Although some may say ASTM measurements are limited, it’s still a fairly defined list of common measurement points to use as the main specification.