Before there were yoga ties and straps and stuff we had knotted socks. A knotted sock does wonders when your arms don't reach behind your back and you need just a little bit of extra length.
In class the other day there weren't any straps in the room and someone really needed a bit of length so her friend said she could use her socks. I was excited - finally, someone using knotted socks, not buying into all of the yoga accessorizing! But the friend didn't really go for it. I tied the sweaty foot parts together so she would have her hands on the ankle parts but it didn't go over well.
I guess we could have used a strap that night.