why not try button snaps? I own a lot of casual button downs shirts that use them. They are rather quiet, much much more quiet than velcro plus you wont get any magnetic interference with anything. Personally I love them. And its a plus in moments of passion 
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"Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." -H.L. Mencken
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