start with a old sweater that you don't mind the color of,
mine was army green

cut sweater at arm pit, cut bottom gathered section off, than cut remainder in half,
should look something like this

cut two middle strips in half,
so you now have two long single layered pieces of sweater

sew ends together, like so

TA-DA
Infinity Scarf

and don't forget to tell everyone
that YOU made it