I wear a two-piece because I can go with lighter tops as the water warms up. I wear my custom 7mm jacket in the fall and early spring and go as light as a 2.5mm shorty in the summer. The jon stays the same. December thru March, I wear a 7mm Harvey's neoprene drysuit.
Here in SC, if you try to clean a boat in a shorty, you come back with bloody, cut-up shins, knees and arms. I'm sure it's no different in CA. I have no idea why anyone in their right mind would ever not cover their skin every time they go diving. There's simply no reason to not be diving a full suit.
...With that in mind, a single-piece 3mm, 5mm, and 7mm should give you all of the functionality you could ever need, except in the very coldest of water. Why you'd want to mix and match and then leave some skin exposed is beyond me.
To boot, with all of this mixing and matching going on, there is no possible way that a wetsuit could seal where it comes together. If you've got a 7mm top that fits well with a 7mm bottom, then when you switch to a 3mm bottom, there's going to be gaps around the legs that allow tremendous water flow... Completely negating the whole point of a wetsuit.
At the rate you burn thru wetsuits, I'd have to buy a new one every month!
Yeah, that's right. Welcome to diving for real, instead of "internet diving."
Talk to the manufacturer of neoprene, and he'll tell you that getting 150 dives out of neoprene is actually really good... That, by design, the stuff is pretty much going to crush down and be worthless in terms of thermal insulation in a matter of 30-50 submerged hours.
I personally dive about 1800 boats a year.
Really? I have no idea how you manage to accomplish that. The most I've ever seen one of my guys handle is about 60 boats a month... Which equates to about 700 boats a year... And that's really rockin'. Most divers are pressed to do 30 boats a month - more like 350 boats a year. How you manage 1800, I have no idea! Unless, of course, that's simply not true.
What's the name of your company again?
Subtracting my time in a drysuit, that means I'm getting about 3300 boats out of a wetsuit. Maybe it's you that needs to think about your choice of wetsuits.
"3300 boats out of a wetsuit?" Hahahaaaaa... Talk to the manufacturers of neoprene and find out how long the very best neoprene is good for. Again, you'll find that 50 hours into it's life, and it's pretty much dead, even if you never hole it. To get 150 dives out of a suit is freakin' great...
...But then again, if you were actually diving for a living, then you'd know that. Based on the things you say here, it sounds to me like your company exists more in your mind than in reality.
Yes, you're right. I'm sure that your wetsuit, factory-made in China, fits better and is warmer than my custom made suit, measured by the person who sews and glues it together and with whom I have been doing business for 15 years.
O'Neill wetsuits aren't made in China - they're made by an individual in Santa Cruz, California, USA... Right up the street from you. How I know this over here on the East Coast, and you don't (when it's literally in your back yard) is beyond me. A very good explanation would be that you're not really a local dive ops owner.
The individual (in Santa Cruz) who is making O'Neill wetsuits has been doing it for nearly 37 years... And was originally hired by Jack O'Neill, the owner of the company and the original inventor of the modern wetsuit. Read the links I posted above.
Given that they've been doing it so long (not "15 years"), they've not only perfected the process of manufacture, but they've done it with some pretty impressive machinery that's capable of the curved, welded, and taped seam.
Where you get this "China" idea, I have no clue... But it serves to punctuate your lack of knowlege pretty well.