JRB, you have raised an interesting question! People line up on both sides of this issue....to wear plastic pants over a disposable or not. Each side has their firm beliefs......<grin>
I feel you are correct in wondering in your post, 'once a disposable diaper begins to leak, will plastic pants contain the leaking?' (not an exact quote)
Speaking from experience, I have worn plastic pants over a disposable in the hope that it would save me wet pants and have been disappointed over and over with wet panty lines on my trousers where the disposable leaked....in spite of the plastic pants. Plastic pants over the disposable diaper provides no absorbancy and "free liquid" that escaped from the disposable won't be contained between the diaper and the plastic pants and will get out at the leg bands, especially when you are sitting.
AND, by the way, the leg bands on your plastic pants must NEVER be tight enough to hold liquid in.....that kind of pressure would leave nasty red bands on your skin and be very bad for your skin.
Plastic pants should not be considered "leak stoppers or liquid holders" which may sound a bit odd for me to say that, but....that is the job of the diaper....cloth diapers in the case of plastic pants. The cloth diaper must be adequate to contain the liquid, which will also stop leaks....while the job of the plastic pants is, simply, to isolate the wet diapers from your outer clothing.
For what it's worth, I believe that if you want increased leakage protection when wearing a disposable, you need to wear some cotton over the disposable and then plastic pants. That has a chance of saving you a leak.
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