If you've got some basic leatherworking know-how and need a spiffy hat for your steampunk getup, give this one a try. It took me 3 hours of construction and alteration on day 1, and 2 hours dyeing and finishing on day 2.
Step 1: Materials
From your leatherworking tool kit:
knife or rotary cutter
leather hole punch
LEATHER (I used a cheap-ass utility hide I bought off a sale rack because the price was too good to ignore.)
Dye and a dauber
20 or so rivets
AND either a good quality sewing machine (I used my home sewing Viking machine, but it's got a great motor) or leather stitching supplies for hand sewing (ick)
Step 2: Take measurements
I measured the interior height of an old hat, and around my fiancee's head.
Step 3: Cut your brim
If you're not real confident about your pattern drafting skillz, do this on paper first. I started by cutting the hole in the brim to the same circumference as the head measurement. It should be an oval. Then, I traced the outside edge, adding 3/4" for hem allowance.
Step 4: Cut the top
I wanted a very dramatic curve on the side band, so I make the top oval much larger than the hole in the brim. Don't forget to add 1/2" for seam allowance.
Step 5: Cut your side band
The sideband starts as a rectangle 2 1/2 inches taller than the hat height you decided on before. The hat I measured was 7 1/2 inches deep, so I cut a 10" high rectangle. The rectangle should be the same length as the circumference of the hole in the brim.
Step 6: Making waves
This is where we hack up the rectangle to give us that dashing profile and steamy look. The "high" parts of the wave are the front and rear, the low parts are the side. Next, cut it in half to make room for the triangle inserts on the sides.
Step 7: Finish cutting
Cut your triangle inserts. Cut them big; this lets us adjust things as we go. Here are all your parts, ready for assembly!