Lay the fabric over the cups. Smooth it out and then fold the edges over the cup and pin it. Use small stitches to sew on the fabric. You can sew through both sides of the fabric here, as this will be covered by the ribbon. The fabric will still be a little loose on the cup, so make a dart by folding the extra fabric and whip stitching it.
Cut ribbon to cover the top of the cups cheap lingerie. Sew it onto each side of the bra. Depending on the size of the cup, you may need to make a straight dart here, as well. Take a large bead or button and sew it in the middle of the bra. Add your coins or beads wherever you like. You can cover the whole bra or just trim the edges.
Try on the bra and test a few dance moves with it on to make sure it's still comfortable and fits well and that there's nothing to fall off or injure you while dancing. Add more embellishments as desired.
Thread the needle and insert it into the cup, through the garment's lining, and back up again to create one stich, tying a small knot at the top and cutting off any excess. Tie small knots every 1 inch around the edge of the cup, connecting only with the lining of the clothing.
Sew the cup by hand, if making it permanent in the garment, by creating continuous stitches around the edges, attaching the cup and the lining, without the exterior of the garment being sewn. Skip sewing if the cups are temporary; to remove the cups, simply snip the ties.
Calculate the correct cup size by comparing the two measurements. If your bust at its widest is up to 1/2 inch larger than your band measurement, then the cup size would be an AA. A measurement of 1/2 inch to 1 inch more than the band size would be an A cup; 1 to 2 inches would indicate a B cup; 2 to 3 a C cup; 3 to 4 inches would be a D cup; and 4 to 5 inches a DD or E cup.
Try on a variety of bras that are both the size of your measurements and a size larger and smaller. Different fabrics fit in different ways, so be sure to try on each and every bra that you are thinking of purchasing.
Try on a size larger if your breasts are bulging out of the cups or the bra band can only be fastened on the loosest clasp.