Update on the shak issue!
I emailed Ibex and they immediately responded and asked to see a photo. I sent a couple today and they told me that they'd put a brand new one in the mail to me! Yay!
Normally I know when I'm hard on my clothing (like the pair of double thick Carhart jeans I wear for farm chores every day that are falling apart at the crotch!), but this just seemed abnormal since it's my newest Shak and the one I treat with the most care. I'm very pleased with their response!
Since I don't have to send this one back, I'll probably try patching it and designating it as 'farm work' attire (since it's no longer work appropriate).