I'm not sure how comfortable this rig would be, or if the second bra would ride up maybe you could stitch the top edge of the big bra to a point below your cleavagebut since Dolly is fond of showing off her most famous feature, I think showing a little skin would be more realistic than just buttoning your shirt up to the neck. My husband is, of course, going as Kenny Rogers. Thanks Amy for all the details What do I stuff it with? I ordered 2 tan colored tshirts online. You can also use the magic tape stuff that you iron on or hot glue. A word from Matt, the 'Boobs' costume creator:
If the second bra is padded, you should be able to stuff with something like pantyhose and still retain the appropriate curve.
Instead of balloons filled with possibly spilling water, try a pair of pantyhose filled with birdseed. This isn't my costume but from looking at it this is what I would do How about these on eBay? Couldn't the inflatable inserts be replaced with party balloons inflated to a low volume? What do I stuff it with?