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Just a note Z...I was checking out your recommendation and found that Aqualung stopped manufacturing the Fusion dry suit last year :-(If you expect changes in body size as you explained, then I would recommend looking for a Whites Fusion or Aqualung Fusion drysuit as your son's first suit.
The Fusion drysuit is a 2 piece suit...the first piece is the core of the suit that is a waterproof membrane material that is designed to keep the diver dry. The second piece is a neoprene (or lycra depending on the model) outer cover that keeps the suit streamlined to the body and also serves as a sacrificial layer taking the brunt of most wear and tear/snags while preserving the core of the suit. The suit's core piece is cut oversize to accomodate a range of diver's body morphology (height and weight) and adapts well to divers that might experience significant changes over the period they own the suit. The outer neoprene skin layer keeps the bulk of the oversized suit streamlined to the body so one is not diving an unweildy oversize bag of a drysuit. The other benefit of a Fusion suit is that it accomodates diffrent thickness and/or layers of undergarments really well, making it quit adapatable to comfortably diving in quite a wide range of water temperatures.
The consensus on Scuba Board regarding the Fusion suits is that folks either love their Fusion suit, or hate it. I have had one since 2018 and enjoy diving with it. In that time frame, my body weight has swung in both direction, so much so that I would have needed to purchase multiple suits to accomodate my size shift had I not purchased the Fusion.
-Z
If a Santi/Ursuit/DUI/SFTech drysuit was the same price as a Seaskin, I'd go with any of those instead. Slightly better fit and finish in every example I've seen. But, for less than half price and made to measure, I'd buy another Seaskin. A big tube of aquaseal cost me $30 and I'm back to diving bone dry again. Note that my issue with the seam tape on the inside of the zipper doesn't even sound that common, and it wasn't a difficult repair (for me - I'm a diy kinda guy), and expensive suits will need occasional repairs too.So my follow-up question, Badger, was do you think all things being equal (ie, assume an off-the-rack one fit your body type) that the quality between the Seaskin vs the off-the-rack ones is similar?