1. Use old sewing patterns as learning and teaching tools.
Old sewing patterns are great for teaching beginners how to sew without ruining more expensive patterns.
2. For the envelope information
You may want to store envelopes in the event you ever run across the pattern again or if you’d like to offer the envelope to someone needing a replacement or information from the envelopes back of front.
3. For spare pieces
Catologue old pieces in the event you or someone else needs a spare.
4. For the instruction sheets
It’s a good ideal to keep your instruction sheets. I’ve purchased patterns that have missing instruction sheets. I search for those instruction sheets through others. I’ve gotten lucky a few times. You never know when you or someone else will need them.
5. For the envelope graphics, photos and illustrations
The envelope art is beautiful. Photograph or scan them for personal creative projects or for the benefits of others.
6. As donations
Give them to a friend or family member in need of sewing patterns, or to someone wishing to start a collection of their own.
Thrift stores and antiquers always welcome donations.
Television shows (Mad Men) accept sewing pattern donations (and clothing) to use on their shows. Theatrical companies use old sewing patterns to make costumes for plays and special events. Other organizations collect and archive old sewing patterns as part of America and history. They LOVE donations.
7. To make other pieces
Use the tissue paper to make pattern pieces. It’s cheaper than purchasing tissue paper yourself.
8. As wrapping or stuffing
Use the tissue paper as wrapping paper. Use the tissue paper as cushioning when mailing packages or as added protection of goods.
9. Help the environment
The paper and tissue the envelopes are made of can be recycled.
What do you do with your old and “unusable” sewing patterns?

Sewing Pattern Portal

"To make other pieces" when I run across a pattern I really like and it's missing pieces-the "easy to make pieces": facings, for example, I use other pattern pieces from other patterns with missing pieces of similar size to make the missing piece for the pattern I plan on using. I hope that wasn't a tongue twister. Good tips.
I understand. Good tip!