Step 2: The weave -1
for the back i would be doing the first weave.
now stretch the t-shirt till the cords roll up.( see....i told you you needn't be perfect)
now...please try to understand.
take the 2nd cord ...pass it under the 1st and pull it down...then pull the 3rd cord under and over the 2nd and pull it down...now pull the 4the cord under and over the 3rd cord....repeat all the way down.