Camera:
Waterproof camera is great. We DIDN'T to that initially (DS had one of those pocket cameras that telescope in/out when you turn them on). Dropped. Now, no more telescoping
SECOND camera IS the waterproof one (just like SuzanneGra and JRH have recommended). NO complaints in the least. PS. Taking underwater pics is fun too!
Flashlight:
SureFire makes great tactical lights as well. Get the incandescent head, since it cuts through steam and smoke. LEDs, while more lumens, get bounced back more in that environment. DS has added the LED one for regular use. EVERYONE on the ship really like it. (drawback.. little special high-discharge batteries.. but inexpensive and quite long lasting). Pelican flashlight, previously discussed, takes standard sized batts--AA, I think.
Clothing:
Ever ship is different, but less uniforms and more Work clothes. Plan on discarding them when your Mid returns. You can't get them clean. And you WON'T want them to even TOUCH your washing machine.
Same with the Engineering Mid, although discarding is not an option.. He WON'T be 'clean' for about 7-10 days, no matter how much he scrubs. It's just ground-in stuff. He's not so much dirty as just... stained.
And from the Engineering group, they universally suggest that the Deckies bring more crayons for coloring up there, in case they run out
(ok. that last one I sorta made up)