All Trick or Treat masks are 100% hand made to order. Please keep in mind that, due to the hand made nature of the masks, variations in size, weathering, color and hair can exist and do not qualify as defects. Also please note that are masks are sculpted to fit the average human head size, which is between 22" to 23" in diameter. Our masks average 24" in diameter, hence fit does not qualify as a defect. If you need to adjust the size of your mask please see their blog http://trickortreatstudios.com/blog/
As for costumes Trick or Treat mainly only provides One Size Fits Most costumes. This will typically range to a medium to large size. Each of their costumes do have measurements in their description if you have any concerns of it fitting.