Measurements
Before you go out costume shopping, get a tape measure out. A cloth or plastic tape measure found in craft stores is going to be a lot easier to use than a heavy construction-grade one, and you can usually find them in the same section as other sewing supplies. Take a full list of measurements, including arm, chest, hips, inseam, neck, and waist. You may need to ask for assistance if you are taking measurements on yourself. That way, when you are looking at the size charts for the particular brand of costumes, you can make sure the one that you are buying will fit.
Sizing Notes
When you are shopping you will often see sizing notes from the manufacturer. Take those to heart, and if it says an item runs big or runs small believe them. If there are no notes, you can usually assume that the costume runs true to size. Some people still choose to buy a size larger in some styles to allow them to wear layers underneath if the weather is cold. Remember that trick-or-treating and Halloween parties can go on for several hours, and an ill-fitting costume will not be comfortable for very long.
Don't forget accessories
Some accessories can also be dangerous if they do not fit properly. Make sure that masks do not slip down into your face and watch for any dangling accessories that could become tripping hazards.
Shorten things that are too long
Fitting kids for costumes, and even smaller adults, can be a bit of a challenge if a costume is designed to fit “most” people in that size range. Skirts, slacks, and long capes and robes can present a tripping hazard when you are out at the party or running from house to house while trick-or-treating. Long sleeves can catch on items and tear, or accidentally fall into candle flames and catch fire. Always wear these costumes with care, and if it is a child's costume consider hemming or pinning the costume to avoid accidents.
A properly fitting Halloween costume will make your Halloween much more fun and memorable. By knowing how to fit the costume properly, you can guarantee that you will find the right costume the first time.
