Adafruit product 641 Ideal for any wearable/e-textile project. It also has fairly low resistivity, 10 ohms per foot so you can use it to drive LEDs
Adafruit Stainless Medium Conductive Thread - 3 ply - 18 meter/60 ft
Conductive Stainless Steel Sewing Thread 50-60Ω - DFRobot
Stainless Thin Conductive Thread - 2 ply - 23 meter/76 ft : ID 640 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Conductive Thread Bobbin - 30ft (Stainless Steel) - DEV-10867 - SparkFun Electronics
Buy Screw Driver and Digital Card Multimeter, Soldering Station Online - page 1
Conductive Sewing Thread Wearable Stainless Thin Conductive Thread for Gloves Metal Thread Reflective Thread Conductive Fabric 316L 20 meter/65ft 3 ply 20-25 Ω/m(2pcs)
Buy Screw Driver and Digital Card Multimeter, Soldering Station Online - page 1
Stainless Thin Conductive Thread - 2 ply - 23 meter/76 ft : ID 640 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Conductive Stainless Steel Sewing Thread 7Ω - DFRobot
Conductive Stainless Steel Sewing Thread 30-40Ω - DFRobot
DFRobot Conductive Stainless Thread (9Ω) - RobotShop
Conductive Stainless Steel Sewing Thread 2Ω - DFRobot
Conductive Sewing Thread Wearable Stainless Thin Conductive Thread for Gloves Metal Thread Reflective Thread Conductive Fabric 316L 20 meter/65ft 3 ply 20-25 Ω/m(2pcs)
Conductive Sewing Thread Wearable Stainless Thin Conductive Thread for Gloves Metal Thread Reflective Thread Conductive Fabric 316L 20 meter/65ft 3 ply 20-25 Ω/m(2pcs)
MR-438D High-speed Electronic Button Attaching Sewing Machine - Industrial Textile Machines