Oh -- that is a BRILLIANT garment for your purpose. No wonder you don't want to lose it. I'd be all over that in your situation.
I wish CocoLion were around -- she might have an idea.
I do think you can see about Ebaying it etc. but writing to the company is also a good plan. Who knows if they have any lingering stock? And then, yes, bringing it to a seamstress and getting her to copy it. In orange or any other bright that makes you happy/ fills the need.