Often (though hard to believe) it needs to be said or else hosts will have guys show up in running shoes. Once, I actually saw someone show up for indoor, no minimum engagement distance CQB in Tevo sandles (not sure I got the brand right...the summer at the cottage strappy hippy brand)!!
I've also played at several "wild" outdoor fields where there's a lot of sharp, pointy things...glass, barbed wire, and machete cleared brush (that tends to leave punji pointed sticks poking straight up).
Comments on foot wear aren't for a fashion-ista look/reason...it's about safety.
So, what's safe to say from a hosts perspective?...wear boots with ankle support.
If the host doesn't care and is ok with you playing in whatever you've got...great.
Don't like the hosts rules...don't play.