She chose the fabric and the design, and together we agreed on the pattern: The Cora Running Tights by Jalie. To add to the visibility I used elastic reflective piping. Yes, it exists....
I thought it would be hard to insert the piping, but it was easier than expected. Yeah!
Pattern: Jalie 3462 - Cora running tights
Fabric: spandex - Funkifabrics.com (Lightshow Black & Performance Black)
Piping: elastic reflective piping - extremtextil.de
-Lengthened by 6 cm: 3cm upper leg, 2cm calf, 1cm just above ankle
-no elastic in back pocket, but double layer of fabric.