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I’ve been a proponent for compression briefs over cloth diapers for years to keep a wet diaper in place and to reduce noise from plastic pants. Nothing has changed there. I also like body briefers a lot to hold things in place, but they can get uncomfortable in the Texas heat and humidity.
A while back, I used a very snug panty briefer over a disposable, which I’ve done, again for years and experienced a very bad leak. I wear disposables (briefs or pull-up, with boosters and pads, or without) often when I’m out shopping for extended periods of time, under jeans or snugger fashions, or otherwise when the bulk of cloth diapers isn’t appropriate. Otherwise, it’s cloth as my default. The brief was new and was very snug, which restricted the diaper from locking wetness in the SAP (I guess), so it overflowed the barriers and soaked my jeans. Fortunately, I was on my way home so the leak was restricted to my jeans and leather car seat....
My recommendation here is to careful not to wear a compression brief that’s ‘too snug’ over a disposable anything that uses SAP, including pads. The capacity will be affected!
As for cloth diapers, I have leaked only a very few times over my life, nearly always at night while using an older (less thick) diaper set, while on my side. During the day, I typically use thinner diaper sets (older nighttime diaper sets) and nearly always wear a compression brief or body briefer. I can count on one hand ever leaking, and usually was due to being saturated.
When you think about it, the volume of void has to go somewhere. It’s either absorbed in cloth, which does not expand, resulting in lesser capacity, or in disposables with SAP, that grows to lock in wetness with greater capacity, assuming it has room to expand....

My experience with compression briefs is that they only work if you have a much higher capacity brief than you need because the compression prevents localized absorption. That is, any void will soak into the brief, but the excess will immediately travel laterally instead of pooling (then absorbing). It's totally possible to have a leak in a barely used diaper.

If you have a series of small leaks (or light incontinence), then compression briefs can make your protection more discreet, but you're going to need more protection than you think because it *will* spread out faster than you think. This is exacerbated by sitting, too. Speaking from personal experience here...

I think everyone who wears disposables learns this lesson at some point. You might think it doesn't matter but body weight combined with a compression garment of some kind and it's like squeezing a wet sponge.

I wear a cotton granny panty over my disposable diapers and it seems to help keep everything nicely in place and at the same time does not seem to restrict the wicking or capacity of the diaper. It does have a bit of stretch to it but not much and it keeps the tapes from getting snagged on my pants. I also like the fact that it's plain white with no feminine "decoration" of any kind and it totally covers my diaper and makes me feel just a bit less like a "patient". The few times I have had a leak (less than a teaspoon) the panty has soaked it up in the cotton gusset and not transferred any wetness to my pants. I've been using this system for years and it's worked great for me.

I think we had this discussion some times ago... How ever - here's the answer to the question from Real World Incontinence and his great tall tale or truth videos:

https://www.youtube.com/watch?v=mB-mhn_hAUM

The RealWorldIncontinence did not address the exact topic we are discussing. I respectfully must disagree with most of you about compression garments causing leaks.

I have worn sports compression pants over premium diapers for years to provide support and have had no problems. Usually I will wear a premium diaper with a booster, plastic or rubber pants, and a onesie.

--John
(double incontinent)

I apologize in advance for my ignorance about this practical tip.
Based on what Ellyn said, I understand the reason why someone may want to wear something tight on the outside of a diaper.
Do you think it has something to do with how tight the compression garment is and thats why there is differing opinion about this?
For what its worth, I wear pullons so I can't speak to this from experience.
I wear spanx which are very uncomfortable but a necessary cost for looking good.
Using the wet sponge analogy that someone else brought up, I can imagine that the spanx would squeeze out the liquid from a wet sponge. However, something less tight would not be the same.

I think one of the most important factors in whether a compression garment will affect the performance of a diaper is the relative percentage of SAP to Pulp in that diaper. I think the high SAP diapers are less affected due to the fact that once moisture touches the SAP particles it will expand no matter what and actually locks in the moisture. This is why high SAP items will expand and even split/explode diapers or pads if they get really saturated. Items with a much higher Pulp percentage are much more like a regular sponge and will not absorb as much if compressed, and in fact will easily release liquid when compressed. In addition I think the actual amount of compression is a critical factor as well. Just my $.02

If something works well for you then that is the way to go, certainly, there are valid benifets form the use of compression shorts.. but I found that there was a clear change in performance when a tight-fitting garment was used over a disposable... our testing showed the compression style short was better than a "brief cut" underwear but still allowed the disposable to leak far sooner than the control ... it was very evident take away was a looser fitting product is better than tighter fitting one.

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compression garments can help keep things in place and smooth out some bulkiness but you should consider light to moderate compression. Something with very strong compression can cause "press out" leakage as others have said.

I find cotton "onesies" usually aren't tight enough and some compression body suits can be way too strong.