Obviously these aren't pictures taken on me they were in the tux shop. Anything that is colored (ie: blue, orange, red, etc..) will be the color of her dress which will either be blue or red, not sure which shade tho.
- https://screensnapr.com/v/ZkjQec.png (WHITE)
- https://screensnapr.com/v/XLFeDf.png (BLACK)
Most Helpful Girl
The black detail on the white suit looks ridiculous. Unless you want to stand out black is always the safest bet. If the person you are going to prom with is super into the matching thing you can ask her for a swatch of the fabric of her dress (yes- many places do sell swatches or they will come with the dress especially if you get it from a prom dress store) and then you can find somebody to match it in a place that sells ties. (Don't match a pattern on her dress- just a solid color) If you just try to get a close match then it will clash- needs to be practically exact.
If you still aren't sure then ask her! Even if you think you're sure ask her anyway! Most girls can ramble about this for hours.