be careful with that top one, 99.99999999999999999% sure it will break off. if/when it does, don't bother with the replacements, try to find something more sturdy from a local tailor or crafts store and replace it yourself.^^ if you can't button them I would send them back. They stretch but not that much.
In 5hours of wear i could button up 3 buttons just needed 1 more
I just got done waiting 7 days and paying $5 to have some lady put a "snap" type button on my UBs, because no one could get the replacement buttons to work. The rivet snaps into the top of the button and took 5 seconds to put on, so I clearly overpaid.