I decided to place this under tips as well as notions--because in all my seeking I was unaware that there WAS a notion to do this before now. Please excuse any inconvenience.
Did you know that when you need to make changes on the neckline, armscye, or the connections between the bust hip waist of your pattern you do not have to do this freehand?
A French curve contains all the curves that will be found on every part of your pattern.
I was, previously unaware of the existence of a tool for this purpose. For the past 2 years my pattern alterations were hand drawn: odd-looking, wiggly, and asymmetrical.
I didn't know that a French curve or hip curve could be used to connect the correcting lines on my pattern to make them look sorta like a human again!
I am a beginner in the use of this tool but I am going back and fixing all the wiggly lines on my patterns!
The link above will take you to a site that will tell you how to use the French curve. (Thanks to Georgene from a thread on the boards--years ago)
I have discovered that a separate "Hip Curve" or "Fashion Ruler" (Louise Cutting--Cutting Line Designs" for one, sells this)
or "Styling Design Ruler" (see link below) seems like a good thing to have because it is long and you can make a continuous
line from the waist line to the thigh. The French curve I bought at Michael's in the paint and drawing department is too short
for this correction and I had to make minute adjustments along the way.
Hope this helps someone else as much as it has helped me!
Styling Design Ruler available here: (NAYY)