There are a myriad of Betty Boop costume dresses on the internet, but you don't need to buy one if you already have a black or red strapless dress. Chances are the dress you already own is not as provocative as Miss Boop's dress, however you can sew it temporarily to create a shorter hemline.
What you need
To look like Betty Boop you will need a black or red strapless dress. It has to be somewhat form fitting in order to pull it off. If it isn't short enough you can shorten the hemline temporarily by sewing it up a few inches. Sew by hand so the stitching is easy to remove later. If you are lucky enough to own a top hat, you can finish off the look with a cap and cane.
You can make the Betty Boop garter by sewing a piece of yellow fabric together and using double sided tape to make sure it sticks on your body. Felt is cheap and works well. After you make your belt, cut out a red heart and sew it to your yellow garter. Yellow lace is another option you can use for the garter. A craft store should carry both the felt and lace.
You could always buy the costume jewelry for Betty Boop at any party store;
But you don't have to. All you need is some yellow earrings and a yellow bangle.
Betty Boop has a pin curl style, very prominent of the time. You don't have to buy a wig in order to get the look, but you will need the time in order to set the pin curls yourself. Check out Hair Boutique for a step by step instruction guide on how to do the curls yourself.
2 hours ago