Write,
The reason you can't use the duct-tape dummy to make a bra is that with a bra, er, how can I put this, the floppiness of the body is crucial to the fit. When you are using the duct-tape dummy to make a dress, for instance, it doesn't fit as closely as a bra, so all you need is the general outline of the figure to 'hang' the fabric on (from the shoulders). The circumference is fairly important, especially if you are making something like a skirt and want it to fit properly, but other than that, most clothes hang from the shoulders anyway. With a bra, the fit has to be much more precise.
Also, to make a duct-tape dummy is rather 'personal' (you need a good friend to help you with it). You need to be wrapped in small strips of duct tape, and it takes about two hours, IME. When you get to the bust area, it is difficult for the 'friend' to accurately contour the shape, over your bra and old T-shirt (which you need to be wearing for this to work).
But it's good fun!
Janet
