Leather Guitar Straps, so many questions...

I definitely want to make leather guitar straps too. I've made them yes, as custom orders, but I think I'd like to have them on my website as a thing for folks to click on and order. I need opinions though:
 What do people like in a guitar strap?
 Which is the best style? 
 Soft leather, or stiff? 
I'm thinking wide, but maybe people like them narrow. 
Should I make them specific lengths or adjustable?
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