Harry Potter. This costume feels inevitable. I think we have been reading HP continuously since 2015. We're reading book 7 at bedtime now, so each of us will have read the entire series individually and together. J is not a big fan of dress up (unlike his sister), and usually asks for a completely impossible costume like a black hole, or dark matter (made it, but never posted the full costume). This year I tried to steer him toward a classic like a ghost or Dracula, but Harry Potter was the only idea that resinated. The second he put on the robe and had the wand in his hand he caught the Halloween spirit enough to forget that half his costume was his catholic school uniform. :)
The robe pattern is Simplicity 8723, it's got the entire size range, and I suspect I will be sewing this pattern again in the future. I used stash buttons, and a hair tie to make the closure, and the Gryffindor patch is from Amazon. I altered the pattern to make full underlining pieces for the front and a deeper facing for the back. I know my HP would want to rush off in search of horcruxes or candy and I didn't want the 4 inch front facing giving him away as a fraud. I hand stitched the lining and the facing. If I had planned ahead I could have done more on the machine but it was late and I was flying by the seat of my pants. Next time I would deepen the arm opening. It's pretty snug for something you're supposed to wear a sweater and button-down under. I also deepened the right pocket to accommodate his 11" hand whittled wand. His is ancient and mysterious lilac from the backyard at the farm. He also peeled the bark with his pocket knife (they're not as dangerous as you might think).
The exterior fabric is gabardine suiting in solid black from Fabric.com*. I had black Kona cotton in my cart, but changed my mind at the last minute. I hate how polyester it is, but I love the weight and drape. It really feels like real clothing feel of the finished robe. I'm telling myself the polyester is authentic school uniform material. The lining is Robert Kaufman Kona Cotton in Crimson* from Fabric.com*. I bought and used a full 2 yards for the hood and lining. I think the color is the perfect Gryffindor shade of burgundy.
Robe Pattern: Simplicity 8723
Gryffindor Patch: Amazon
*Fabric.com links are affiliate links.