I've seen enough bad super-hero costumes over the years that it takes a lot to shock me. But I have to admit, Hydroman's unholy abortion of an outfit leaves me almost speechless:

First of all, you know you're in trouble if you let Rainbow Boy design your outfit. Because if you do, you're going to end up strutting around in white nylons with hot pink boots and shorts.
Second, how on Earth does a water-based character end up with a deep-see-diving collar surmounted by an aviator helmet?

I know that personally, I always protect my precious leather accoutrements by routinely dousing them in water.
At this point in the analysis, I had two distinct working theories on how this costume came about. On the one hand, I thought maybe he was drunk the night he got his powers and just threw together whatever he could find in his mother's closet. On the other hand, I thought it was a distinct possibility that his sidekick "Rainbow Boy" designed it for him.
Then I stumbled upon this view of his outfit and I was more confused than ever:

That's right, folks -- Hydroman is going around performing super-heroic feats in a hot-pink thong.
So you tell me, is that a result of a drunken revelry through Mrs. Hydroman's closet, or the puckish fashionista Rainbow Boy having a bit of fun with his straight-laced mentor?
(Images from "Heroic Comics" number 26, 1944.)
I hate to be the one to bring this up, and it’s not like I enjoy pandering to stereotypes, but…your sidekick/partner goes by the name “Rainbow Boy.” He dressed you up in a white bodysuit and a pink thong. Did it ever cross your mind to question if Rainbow Boy was gay? I’m just going to throw that one out there, Hydro-Man. Give it some thought.
I don’t care if the designer was heterosexual or homosexual; there is no way a concious person would design this without some malicious intent. I’m sure the designer has some deep seeted hatred regarding Hydroman without a better outlet for his or her feelings.
In hindsight, last thursday’s ramdom pannel was actually an improvement over this dorks superhero costume.http://www.heromachine.com/2011/04/28/the-boy-scout-kidnapper-motto-be-prepared-for-anything/
The worst part about this costume isn’t even apparent in the pannels shown. I looked up some of the covers, and it looks like the actual bodysuit is made out of saran wrap.
http://www.comicvine.com/reglar-fellers-heroic-comics-/37-170784/
Hydroman was probably drunk while Rainbow Boy was designing his outfit.
Costumes like that make me love the “random” feature on Heromachine 2.5.
Dan, Nope! That’s supposed to be HydroMan turning into Water, costume and all!
Of course, THIS from a Magazine for “Reg’lar Fellas”… 😀
I think he may be too distracted by the headache that he constantly gets from his leather cap squeezing his skull, as it shrinks when it gets wet. So, I don’t think he knows how stupid his costume is.
Rainbow Boy is another stupid costume canidate.(As seen in the second link given by Dan. Very strange stuff. Hydroman seems to form out of any source of water and Music Master forms out of any musical source. They actually have him(Music Master) coming out of the Liberty Bell on one of the comic book covers. So, I guess that if you start singing he’ll come out of your mouth, or the beak of a songbird. I guess that’s better than Sound Master, if he exists. Sound Master would be able to come out of another body part that makes a noise. And I guess Hydroman can come out of your urine, tears and sweat.
I just want to see the Hydroman/Aquaman teamup. Or at least a Rainbow Boy/Aquaboy beatdown.
Wow this guy is totally lame on all fronts, but his super power is so cool! But the worst part about this is his costume is all wet!!! (Sorry someone HAD to go there!!!)
@William (6) Here’s another shot of it, when he’s just standing around. The caption calls it his Translite Suit.
http://www.comicvine.com/hydroman/29-59140/all-images/108-215661/hydroman_a/105-717150/
As a gay man, I’m as big a fan of rainbows as the next, but keep in mind that we’re kind of known for good fashion so a horrible outfit design isn’t necessarily a sure-fire indicator of being ‘somewhere over the rainbow’ 😉
I mean it’s not as if Rainbow boy wears a similarly be-thonged costumed with a giant rainbow mohawk, sashaying his way through the air on a ridiculous rainbow beam. What’s that you say?
http://www.comicvine.com/rainbow-boy/29-60071/all-images/108-209262/rainbowboy/105-715774/
Oh. Well then 😐
(11) God, I think Rainbow Boy is the WORST character costume I’ve ever seen!
DiCicatriz (11): You know what? I’m not as convinced Rainbow Boy is gay anymore. See, I thought maybe Rainbow Boy was trying to turn Hydroman into his unwitting arm candy, and then just started messing with the guy, dressing them in more and more ridiculous things to see if he’d do it. Having seen Rainbow Boy as well, I’m now convinced whoever designed their costumes, be it Rainbow Boy, Hydroman, or Edna Mode’s evil twin, it’s clear the actual designer is a shameless, malicious fashion sociopath who takes pleasure in dressing superheroes in absolute trainwrecks of costuming.
Not to say Hydroman and/or Rainbow Boy aren’t gay. Just saying it’s now inconclusive as I see it.
I know I’m going to regret asking, but…is Rainbow Boy called that because of the prism effect when Hydroman, er, sprays? If so, it would explain the costume: simple, sweet revenge.