Is this dress okay? Semi-formal wedding in midwest, indoors, not at a church

A friend from college is getting married next weekend, and i’m running out of options and time.. the dress i planned on wearing doesn’t fit me like it used to… i thrifted this dress yesterday, is it okay? or do i need to go out and try again. not sure if the conservative-ness of the crowd, but given it’s not at a church i’d say it isn’t a problem.

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