At the end of the last episode when the synthetic fibre-devouring Full Monty Virus has started melting everyone's clothing, how is Hayashimizu able to put his coat around a naked and crying Ren to help preserve her modesty? Simple- being the traditional, old-fashioned, serious guy that he is, Hayashimizu wears all-natural, all-cotton or wool clothing which is immune to the virus.
Kurz, of all people, was asked by Tessa on what she should wear for the swimming class at Jindai. Naturally, he (with the other SRT/PRT operators) advised her to wear the blue swimsuit. Since he's lived in Japan for most of his life, he most likely picked that idea up from his fellow classmates who happened to be perverts too.
There's a good deal of foreshadowing that Ren Mikihara is part of a Yakuza family early on. First, when Kaname is taken hostage by the gang, without being told, she pulls the curtains to the room shut as Sousuke is preparing to go all Jack Bauer on the messanger. And when they visit Sousuke as he's pulling a Sgt. Hartman routine on the rugby team, Ren is the only one who seems untroubled by Sousuke's coarse language. She'd probably heard similar when her father's subordinates were being disciplined yakuza style.
There's a very logical reason why the Bonta-kun armor wasn't very popular with anyone other than the Miami police: camouflage. A giant cartoon rodent would stand out on the battle field. In a city famous for its amusement parks? Blends right in.
