Just for fun and kicks - try putting on a clean, dry long sleeve shirt
and long pants (cotton is good for this test; try white, khaki or
denim) then put on the dry drysuit making sure the seals completely
touch your skin at all points. Jump in the water and thrash around a
bit. You'll find out soon if there are leaks and if you dry off the
suit before taking it off you should find out where water is
transferring, if anywhere.

You'll also get some interesting bystander looks.