How is your sense of humor? Are you prepared to be razzed? Are your ego and your sense of self-deprecation secure? Are you a proponent of rash guards and compression underpants in judo? Do you have a purse that matches your judo shoes?
sense of humour: good i think, my wife sometimes disagrees
self-deprecation: as required
rashguards: not normally, but whenever its necessary for health reasons, I wouldn't mind it. I wore one the other day, as I had a nasty burn on my arm after spilling hot coffee on myself. In winter, I've often seen older sensei wearing them, presumably to keep warm as they were just walking around supervising the class and not generating their own body-heat. I've also seen young fierce competitors wear them, I'm guessing to increase tolerance for discomfort, or sweat more (doesn't seem valid to me, but, whatever). I recommend them to kids who come in sun-burnt and are constantly distracted.
compression undergarments: ??? no thoughts on it one way or the other. I had a sensei tell me he always recommends against silk boxers for the kids, as it makes their pants slide around too much. I prefer just my normal undies, 'boy short' i think they are called. just went googling to find you an image, but it was too disturbing -- lace men's undies, low-rise mankinis and all weird crap! My Japanese friend tells me it's normal over there to have nothing on underneath.
purse: no ... BUT i've long thought of sewing a little open pocket inside my training gi to hold my mouthguard during breaks from drilling/randori ... one day I'll get around to it. It's at times annoying to use a mouthguard, but you get used to it, and it's cheap insurance. I've had and seen occasional teeth-clashing accidents over the years, and has always seemed just a fraction away from dental injury.
judo shoes: yes! i had a cobbler make me a pair of custom kangaroo skin sambofki that i use, when needed. they are perfect for training through the various toe injuries that can occur, quicker-less messy-cheaper than tape.
CK: thanks for the story. I recall being a kid browsing the yellow pages for martial arts to study, and i saw Judo but dismissed it as 'too wimpy, it's GENTLE and not complete without punches kicks weapons and breaking boards.' what an idiot i was! so many wasted years.