I love wearing my leather jackets & boots in the rain if it's good quality leather, it can take it and look the better for it. If it's a new jacket, all the better because the jacket will mold better and break in faster. Just wear it, treat the jacket with your choice of conditioner when need be after a dozen years of wear and forget about it
Selvedge denim in the rain though... Stiff as heck.
Oh im not worried about it! I just find it a bit ironic that the leather is not remotely water repellent considering they are marketing it as a "motorcycle jacket".
I am still going to wear it in the rain and wear the crap out of it. Most of my jackets have been on the bike, in the rain, in the sun, you name it.
I don't believe in buying things i can't wear. And you are right, wearing it in the rain and keeping it on until it dried did help the break in a lot.