Neither dress is suitable for a wedding. Try again.
You better get shopping. I'm certain you can find something appropriate in your price range. Your senior prom dress looks just like a prom dress, not suitable for a wedding, you will stand out.
The blue cocktail dress is too short. You should dress a bit more conservative for a wedding, the dress should hit close to your knee.
It's appropriate for a cocktail-style evening wedding. Not dressy enough for black tie and too dressy for a casual wedding, outdoor wedding or beach/destination wedding. Appropriate assuming it's long enough to hit close to your knee and also that you wore a jacket or shawl.
ETA: With additional details, sounds like a good fit.
Only if you are very slim. You must wear high heels with this, as anything else will look funny. Note that to find the right jacket for that kind of dress will be very difficult.
If the weather is going to be bad, take a broad and beautiful shawl to elegantly wrap around your shoulders. Wear nothing else that falls out of the ordinary. Enjoy yourself!
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