Using double condoms
is a a rare thing in my medical experience.
If you are so large you need 2 to guarantee integrity of the condom, perhaps this is an answer. Are you sure you have tried all of the "largest" & most durable condoms? You & a condom & her with the use of foam, film, suppositories or sponge may be a better alternative. I think the two of you need to have a long talk! get help?