The sewing pattern companies reuse their pattern numbers. So, when you are searching for an older pattern you need to know not only the pattern number you are searching for - but when it was printed, or a description of the item so that you can find it. Simplicity 1234 could be a dress one year and a few years later it could be a shirt pattern. If you can't find a pattern you wanted from years past, here's some links:
How to find out of print or discontinued sewing patterns:
I can't find the instructions for a pattern I want to use. I looked on the Simplicity website and it was not there either (neither is my pattern). Any help appreciated! This is a short set for youngest granddaughter.
You didn't' mention what type of pattern it was...dress, pants, top, etc. I'd be more that happy to help, if I knew what it was you were sewing. I've done everything from my own wedding gown to swimwear, lingerie, suits, etc. Garment construction is pretty basic, just like building a building.