Step 1: To make the bra...
I chose to use stretchy fabric in a similar colour so it would match the straps. Use stretchy or jersey fabric so that it will mould round the shape of the bra.
Here I've already done one side, stage right is still to be covered.
Pin the fabric on around the edges of the bra. If your fabric has a pattern like mine, try to line the second side up with the first.
Fold the excess fabric back on itself, and then fold it over the edge of the bra. For the parts of the bra where you can't fold the fabric over, the band/straps etc, try to just pin these parts in place. The next step will be to spend a LOT of time and small stitches sewing this into place. Use lots of pins as this part is really tricky.
Ok so this bit takes ages, like hours. At first it'll be fun to do while your watching the tv, by the end you'll be having nightmares about tiny little stitches coming to get you. However, if you keep at it it'll look really good when you've finished. As you can see in this photo, the stitches at the band are pretty much invisible.