1.Use a tape measure to measure the circumference of your doll's head.
2.Lift the circled tape measure up gently and set it down on a piece of paper; draw around it once (this is the pattern for the crown) and again (this will be the pattern for the brim).
3.Decide how wide you want the brim of the hat to be, and draw a second circle around one of the smaller circles. Cut on both lines to make a doughnut shape. (For example, for a hat with a 1/2-inch brim, you'll have a doughnut that's 1/2 inch wide with a hole in the middle.)
4.Let the tape measure unfold and measure a rectangle as long as the circumference of the first circle and as wide as you want the crown to be tall (for a 12-inch doll, 1/2 to 1 inch; for a 24-inch doll, you may want as much as 2 to 3 inches), plus 1/2 inch or so (in length) for overlap.
5.Cut and construct the hat in whatever material you desire and allow to dry: Felt is sturdy enough to hold its own shape (though if you want a very firm hat like a top hat, you'll want to glue the felt to thin cardboard). For a floppy, floaty, big-brimmed hat, use cardboard to line the crown and use two layers of fabric (glued together for structure) for the brim.
6.Trim with flowers, fruit, ribbons and bows if you desire.
7.Make the crown by bending the rectangle into a circle; glue it and let it dry.
8.Lay the brim down flat on your work surface and squirt a circle of glue around the inside edge.
9.Set the crown (the ring) into the glue.
1..Squirt a circle of glue around the top edge.
1..Set the top of the crown onto it.
Overall Tips: If this seems like too much work, cut out a triangle, tie the long ends under the doll's chin, and tell your child she's hiding her curlers. Alternatively, many craft stores sell untrimmed hats in standard doll sizes.