@grannysyb A Sloper is a generic pattern based on your measurements without any seam allowances or style.
It's the building block of all patterns, helping you to not only sew clothes, but design your own perfectly fitting pattern or help you to adjust ready made patterns to fit you perfectly.
Similarly a ‘block’ is the same sort of idea but includes some ease. I’ve tried making a block using my own measurements for designing trouser patterns, as it’s a fairly simple shape.
The link below might help to explain it in more detail?
https://sewguide.com/how-to-make-sloper/