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Buying underwear a size too small is just going to be uncomfortable and will ruin your profile.
Avoid stretchy fabrics;
its a fallacy to think that they will squeeze you in,
what actually happens is that you will stretch them out.
A proper gaff is one solution.
Another is a pair of control pants, in which the control part goes all the way down the front.
A friend of mine once put a triangle of cardboard down the front of her pants, not comfortable but quite effective.
A more sensible idea would be to get a triangle of soft leather (leather doesn’t stretch) and fit that into the front of your pants.