The pattern I used had me begin the gusset increases 3 inches from the total foot length and it ended up being almost an inch too long. So, I picked out the toe and reknit it to my actual foot length and I used that extra bit to cast off the socks. I also to maximize yarn usage towards the end I grafted the two ends together, knit to the very end of the purple, through on the red, did a stretchy cast off and voila.
