I’m only a home sewer, so only have measurements for family. I always use a standard form when taking measurements that cover all the areas that I use, so everyone’s measurement file have the same items on it. I put the person’s name and then the date in the file name so that each person’s measurement file will be listed under each other in date order because I use the YYYYMMDD format, eg. Duperron E - 20190115. Here is an example of my measurement chart that I used to give the local ladies a lesson on Seamly2D using the books written by Winifred Aldrich: Tape Conversion Chart.pdf (1.3 MB)
With multisize files, they have their own folder and one for each range of sizes is sufficient, so I include the size range in the name of the file. (I normally state the pattern system that I am using first and then the size range.) Eg. Aldrich 32-36.
As for your patterns, that would be a personal thing since you may only use a pattern once as a bespoke or you may use it many times, only changing the measurement file and, perhaps, adding something small to it or removing something.
If it’s a bespoke, I’d suggest using the person’s name first and then a short description. If not, then just a short description or a number reference, if you’re going to have a database (since you’re into IT) to keep all the details of all your patterns.
Basically, it’s whatever suits you best.