Are you using these patterns more than one time? And, are they *real* patterns with seam allowance included, trued, notched and drilled with each piece engineered (i.e. under-cut, over-cut, controlled fullness, etc.) to account for processing (i.e. fulling, shrinking, gathering, shirring, folding, mating, turning, lining, etc.)?
If not, then, you're cutting drafts which is perfectly fine...
The trade-off is the paper isn't heavy enough to accurately copy pieces or use flat patternmaking methods to engineer the pieces with a high degree of precision. If you will only ever make one-offs, then 40# - 80# kraft paper is sufficient. Especially if the one-off maker will draft anew with each project.
As I keep saying: context matters.
This rant it's not directed at you, specifically:
Words are not interchangeable. Please respect them and use them like carefully selected tools. While it is possible to drive a screw using a hammer, the workaround does not compel the hammer to be a screwdriver.