Bad inking job. It seems to be happening a lot in the comics lately. Probably because daily strips used to be drawn in black and white and on Sundays were in color. Now they have to be in color every day.
Be aware that Good Will is a profit making company. Try to shop at the Salvation Army or other independent thrift stores. Most of them are non profit and have lower prices. Also, I never buy anything with the swoosh on it, even in a thrift store. Nike uses slave labor in China to make many of their products. Do not give them any free advertising by buying their products, even used.
There are places who will repair or replace the zipper. Most of the time it is the slider which pulls the sides together and apart that is really broken. As long as the sides of the zipper do not have a tooth missing it may be the slider which is defective. In my area there is a shoe repair shop who also fixes zippers.
Unfortunately Lynn Johnson developed an illness and had to stop For Better or for Worse.