I've seen a few interesting ones in umpiring higher level netball matches, although some of them are for very good practical reasons. The serious players and umpires don't wear any old trainers, they wear netball trainers, which are especially designed with the sport in mind. They are only certain brands, more rigid than running shoes, especially around the heels and ankles, to give some protection against sprains. You can't get them in many actual shops, not even ones which separate shoes into different sports: you usually have to order them online. And the players don't wear "dresses": they wear uniforms (or at least, they're referred to as such in the written rules). Some leagues also have the rule that umpires must wear white, which is clearly different from the players' uniforms.
What's also notable is the pile of Crocs, sliders and occasionally Birkenstocks beside the court, or Ugg boots in the winter: the players who value their shoes only change into their netball trainers just before warming up for the match, and afterwards, they're straight back into their Crocs and socks for the short walk from the court to the car. I was a bit surprised by all this, until I started umpiring the higher level matches, and saw it all the time.
Another sight sometimes seen is the children on camping chairs playing on an ipad, sometimes completely covered with a blanket in cold weather, while mummy or big sister (or both) plays her Saturday netball game.
Another one I've seen is swimming teams in matching onesies and flip flops when they're out of the pool.