Your will need...
- yarn (*4ply patterned sock yarn is ideal*) any
- knitting dolly
- darning needle
- 25cm *5mm* elastic, thin enough to thread through tube

Usefull
- safety pin for threading elastic

How to make
1. make 30 on dolly
2. thread 25cm (25cm twice round in not very stretchy) of elastic through and knot or sew ends
3. sew end of tube together

1a - you could use [icord] instead of tube made on cord

I did make lots of these so that people could wear pink on Breast Cancer Day in March