Just a neat sleeve pattern that was donated to the archive lately. Someone saw it on the back tables, mentioned that Simplicity had done a reprint of sleeves, and was asking why there would be a need for sleeve patterns alone.
It is a combination of home sewists not having full-blown drafting skills per se and the need to adapt garments you already own to have something slightly different without buying something that was entirely new – especially if you were lower-middle or working class.
Patterns like these were the standard for adapting existing garments and would have been traded between friends as little additions to stay in the current style without breaking the bank.
If you like to trace it out, or are interested in a bigger write-up about individual pieces like this, just let us know and we can make that happen!