My old Rabbit felt AB (that I no longer own) gave me every wrinkle, crinkle, bulge and divet that I wanted from it. Of course, I was intentionally creasing it to look wrinkled and rumpled, like the Cairo hat, so some of the results I got may have simply been from my own creative bashing methods, rather than being an inherent trait of that type of felt (it was rabbit, but not a particularly thin "dress felt"). Still, if I had another of those rabbit AB's with an open crown, I'm positive I could get some of those "Hawaii crinkles", if I wanted to.
Here's an old pic of my AB rabbit (L) next to my AB Beaver. You can see some crinkling in the non-bow side dent on the rabbit felt, but this effect did not ever materialize on the beaver felt. (There were crinkles like that in both dents of the rabbit hat, but you can't make them out in the bow-side dent due to the lighting.)
I'm sure the thinner felt of the Optimo would easily duplicate this effect without much coaxing or creative bashing, but the AB (well, the old rabbit AB's anyways) can do it, too. Now, the beaver felt AB's of today might be a different story. If I still owned mine, I'd give it a try just to see.