The photo shows you the simple step to measure your head for choosing your correct wig size ---
19" = Child
Fit most children 8 to 14 years of age.
20 3/4" = Petite Petite
Also called Ultra Petite by some manufacturers, is the smallest size available. Very few wigs come in this off-the-shelf size. This size is usually for a child but may qualify for a very small woman. See about sizing for further help.
21" = Petite
Petite is a very command smaller size for petite women.
21 1/4" = Petite-Average
The closest measurement to fall in this in-between-size is 21 1/4". This qualifies you for petite or Average in most cases.
21 1/2" = Average
Average is usually quantified as 21 1/2". As you can see there is very little size difference in these measurements. Fortunately, 97% of all wigs are sold in the Average size.
22 1/2" = Average Large
Average Large is 22 1/2 for most manufacturers. Very few wigs come in this size and those that are made in this size are short styles for the most part.
23" or more = Large
The large size calls for a 23" to 24" head size and once again, it is usually made in short styles so see *sizing for further HELP!
Remember, the sizing is just a guideline. All manufacturerers have their own sizing techniques. There are many simple methods to make your wig feel more secure on your head. There are elasitic pull fasteners at the back of the wig behind the ears. For starters, pulling these fasteners to a comfortable position is usually all it takes to make your wig a better fit.
THIS IS JUST A GUIDELINE. WIGS DO HAVE SOME STRETCH IN THEM. LOOSE IS BETTER THAN TOO TIGHT. Wig circumference can be adjusted up to 1" larger or smaller to ensure a secure fit.
For those who need professional sizing! This can be done and we make these amendments to our customers wigs at our store in Tigard, Oregon. For those who are good at making tucks in the waist of pants or skirts - it is pretty much the same type of adjustment. You just double down or cut out the area not needed and sew it together again.