I made this handbag specifically for going to conventions, just in time for Emerald City Comicon! I started out with the diamond shape (from Superman's logo) but I decided to do it in black and yellow (Batman colors) so I could use black leather.
I didn't use a pattern, other than drawing out a diamond shape. All of the sides are basically rectangle pieces so I just had to measure the lengths of each side and then make all of the strips 5 inches wide. I added an 18" black zipper to the top and a 7" black zipper on the side (for a secret side pocket). The lining is yellow satin fabric I had leftover from my World of Warcraft Priest costume.
When it came time to add a strap, I struggled with indecision. Do I add D-rings and then make a strap out of the black leather? Where am I going to find the right hardware to make the strap adjustible? Then I looked over in the corner of my craft room where I had a pile of Warner Bros. bags I had hoarded from SDCC 2011. I had a "duh!" moment before I whipped out my thread ripper and pulled the strap off one of the bags (which had Big Bang Theory on it). Not only did the strap fit perfectly, but the colors were spot-on!
