I usually trace a pattern off onto butcher paper to avoid ruining a multi-sized pattern. That’s because I am a different size from either of my two daughters, and they are a different size from each other. I don’t like having to cram the traced pattern back into the original envelope so I have developed a method to make it easier for me. I use 9″x12″ manilla envelopes to hold the original pattern and all the tracings and pattern pieces. I sketch a picture of the garment so that I can spot the pattern quickly in the drawer, but I also sometimes use a color xerox or computer image of the pattern front.The envelope above shows an image from off the computer. I usually write the pattern number, who it is for (which daughter), the size and garment sketches:
Sometimes, I just use the original pattern envelope for the image on the manilla envelope, cutting it apart and taping or gluing the front to the front and the back section to the back.
These big envelopes are so much easier to get the pattern pieces in and out of, and there is lots of room for making notes like how big the hem was, the size of seam allowances you used and all the other things you are sure you will remember but never do.