I've read (here and elsewhere) several people's frustrations with getting their breastforms to stick. I love bras, but sometimes and with some outfits I like the braless look (plus it feels great). I have had intermittent success with getting my silicone breastforms to stick using those adhesive strips that came with my forms, but I think I've found the technique that works without resorting to radical or laborious measures.
The culprit, I believe, is skin oil. Even after you've bathed, there's going to be some residual oil in your skin unless you take steps to get rid of it. Here are the steps that work for me:
1. While bathing or showering, shave your chest closely. I don't have a hairy chest, but even those tiny hairs can impede a good bond with adhesives.
2. Next, I use one of those net scrub thingies - you know, the ones that look like a sea creature - and bar soap to scrub my chest vigorously. A rough sponge would probably work just as well. Be thorough - your skin should be slightly red when you're done.
3. Towel off and give your skin a few minutes to air dry before proceeding.
4. As an additional measure, you can swab your chest with rubbing alcohol using makeup pads.
5. Apply the adhesive strips to your forms first, taking care to place them very close to the edges - placement is key for adhesion and appearance, so take your time. I use three strips per form - top and two sides. It's okay to cut the side strips in half lengthwise so you don't have to use as many (they're kind of expensive), but I use a full strip for the top edges. And if your forms are large you should stick with full strips.
6. Peel the backing off the adhesive strips, being careful not to touch the adhesive sufaces any more than necessary. Even a few minutes after bathing, your fingers will have oil on them.
7. As you position each form onto your chest, lie down on your back and press all along the edges firmly with your fingertips. Then put on a bra to hold the forms in place for at least 15 minutes as you do your makeup or whatever. This will give the adhesive time to bond with your skin without any slippage.
That's it. Your forms should stay in place without any problems. I've worn mine for as long as 12 hours, changed clothes, danced, slept, etc. But in the summertime I do keep a bra handy because enough perspiration can loosen the adhesion. I just try not to sweat.
Did I mention that going braless feels great? And apparently they look good too - don't be surprised if someone wants to feel! :GE: