I usually make my daughter's Halloween costume and this year I did it without sewing a single stitch. How? Well mainly LOTS of hot glue. :) Here's what I did:
Gathering the supplies: child's hooded sweatshirt, old plastic hangers, faceted "water ball", 1 yard fun fur, hot glue, white yarn (not pictured) and white craft foam (not pictured)
I bought the sweatshirt at Goodwill and it didn't matter what was on the back because the back gets completely covered.
First, lay your sweatshirt on the wrong side of the fur with the arm extended so only the cuff passes the end of the fur. Then bring the top of the fur over the hood meeting the edge of your fur to the edge of the hood. Glue into place.
Cut fabric where the hood and shoulders meet.
Make sure hood is laying flat then begin to cut the fur where the hood and the shoulders of the sweatshirt meet. This allows you to continue wrapping fur along the hood and frees the rest of the fur to wrap the sweatshirt arms. Note: try to keep scissors close to the base fabric and under the fur. If you can avoid cutting through the fur it will look more natural.
Wrapping the arm after cutting from the hood outward
Here, you can see the fur wrapped over the arm after the cut. Once you have made your cuts, you can finish wrapping and gluing the fur around the hood. On the sides, I wrapped about an inch around to the inside of the hood because I knew that it would be visible when it was worn.
Spider needs more arms!
The same cut is made on both sides and the fur wrapped over the sleeves. the rest of the fur is cut into two spider arms shapes on each side. The plastic hangers are snapped in half and used to give the arms support. If your hanger has jagged, sharp plastic where it broke you can melt it down a bit with the tip of your hot glue gun. (I advise you not to breathe in the melting plastic fumes - ventilate!) Strings of white yarn are glued into the seam where the fur wraps around the sleeve then down through the other two arms. This will make the fake arms raise when the spider raises their real arms!
Finishing the edge
After covering the fake arms with pieces cut from the excess fur, you can use the bias edges of your fur to trim the belly edge of the costume. This helps take the raw cut edge of your fabric and softens it with fur that extends nicely into the belly. Also, the bias edge of this fun fur is mostly white and blends the fur nicely into the color of the sweatshirt.
Using a steak knife, I carefully cut the waterball in half in my kitchen sink. Then I washed it and let it dry before gluing it to the top of the hood to serve as the spider's eyes. I cut two fang shapes from white craft foam and glued them to the inside of the hood. I had enough excess fur to fold a furry "butt flap" (actually the spider's abdomen) which I glued on the sweatshirt under the fur across the back.
My daughter really enjoyed her spider costume. I hope that you enjoyed it too!