Teenage Mutant Ninja Turtles. My daughter's TMNT costumes weren't made from a pattern because there were no patterns. I combined a couple of patterns to get the look I wanted. One Halloween she was a TMNT; the next year, we added a long overcoat from the thrift store and she went trick-or-treating as a TMNT disguised as a man. One father, out with his son, didn't get her costume and made a snotty remark. His son, who DID get it, called Dad on it right away. "Dad, don't be so dumb. She's a Turtle disguised as a man. Duh." Making everyone but DD (Dumb Dad) happy. Butterick came out with a pattern for the Turtle costumes in 1990. 
Clowns. I can't resist clown costume patterns. Even if I know I already own 3 copies, I have to buy every one I see. This 1965 Simplicity pattern for Happy the Clown, Bobo the Clown, Bubbles the Clown and Jingles the Clown is my favorite. 
What Halloween is complete without a witch or two? I made this witch costume around 2000. Still love it! I may have a scrap or two of that black and silver fabric around somewhere! 
Not only did I sew costumes for my girls, I also made matching costumes for their 18" dolls. I usually had to modify an existing doll pattern. This Pumpkin Costumes pattern for the entire family includes a costume for the 18" doll AND the family dog! 
My last "favorite" costume pattern is another I made. Three girls, 3 M&M's. I still have at least one of these costumes in the Halloween tubs. Maybe someday, a grandchild will wear it..... 
The last costume I sewed was for myself. I made two (if one is good, two is better!), one purple for "dress", one black for everyday. Simplicity 9887 is an easy pattern to make if you want to whip up a wizard's costume with a little pizzaz! If it is September, Halloween is just around the corner. Time to find your favorite costume pattern and start sewing!
