I personally like organza, but I suggest doing whatever you like, regardless of what you think others might like. Or maybe get your FI's input, it's his day too!
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Haha this made me laugh. Can only imagine if I asked my FI his opinion on chair sashes .
I prefer the organza ones if doing all the chairs, or the satin ones maybe just for the aisle row. I like when they're just on the aisle chairs personally- looks classier to me. I don't really like the look of all the bright sashes on the white chair covers, but that's me and I hate chair covers .
I don't think you need to match your dress though! i don't think I've ever looked at a pic and was struck by whether the fabric matched the dress or not