When it comes to weddings, there's a good deal of etiquette guests should adhere to. Even if you're part of the wedding party, or you're a close relative of the bride or groom, there are some rules that you can absolutely never break.
For instance, you can't upstage the bride. That means no wearing white, or anything that could take attention away from the bride on her special day (or the groom, for that matter).
In a Reddit post on the Wedding Shaming sub, a user called u/fatgirlfantasy posted a pic of a bride's mother-in-law, who wore a short, revealing dress to the wedding. The initial post gained a lot of attention before being removed from the sub's feed, having users divided on whether or not the MIL broke the unspoken dress code.