Guys, what do you think is a reasonable price for your wife/girlfriend to spend on a formal dress for an event?

I am just curious what guys think would be a reasonable price in your mind that if your wife/girlfriend told you she spent X on a dress, you'd be like, yeah, cool....

Guys, what do you think is a reasonable price for your wife/girlfriend to spend on a formal dress for an event?
Guys, what do you think is a reasonable price for your wife/girlfriend to spend on a formal dress for an event?
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