this was one of my fave tops but it didn't fit me anymore.
first cut to the length you want but make sure that you leave room for a hem.
trun it inside out.
sew about an 1 inch inside on the side that was already been sew together. and cut the rest off.
trun insde out again.
hem the bottom.
cut a hole in the side for your thum.
sew the sides of the hole.
its a bit triking.
and your done.