2 way stretchable, fusible interfacing in black from L'Oiseau Fabrics.
Wholesale Heat N Bond - 60" Fusible Tricot Medium Weight Interfacing - White
Using fusible iron-on stretch interfacing for knit fabrics
Soft Fusible Knit Interfacing - 60" (Tricot) - The Sewing Place
Amazon.com: Superpunch White Fusible Knit Interfacing, Sof-Knit Fabric Interlining Woven- 60''Wide HTC1725-1, Embroidery Stabilizers- All Bias Stretch, 100% Nylon, Sold in 5 Yard, Made in USA
60" WIDE FUSIBLE TRICOT FUSI-KNIT INTERFACING
Knit Fusible Interfacing - Grey – Fabric Box
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