You have to know someone's personality to know whether they accept being teased or not. Some people enjoy it, others don't. It is up to the person who might tease to get to know another person and have some sort of relationship in place where they know it is OK to have that form of joking. Different people have different senses of humor, and it is the joke-teller's job to know their audience. It is not automatically OK to tease.
It is always better to err on the side of politeness and kindness.
They are cut differently. They vary the thickness and material around the suit. They do provide floation but not like a standard wetsuit. This is what they kinda look like: https://www.xterrawetsuits.com/pages/googlespecials?gclid=Cj0KCQjwjbveBRDVARIsAKxH7vlXreDJMdGTGCq0QKosC7CeahTCuuq-irBdKHS5he5F1brjSvl0nn8aAnnwEALw_wcB
We wear the "official uniform" in transit to outings. Actually we call it Class A and are just hoping the uniform and or phrase police stop by and try to ticket us.
But anyway, when we arrive, the Scouts take off the class A (typically tossing them into the dirt) for setup, activities, etc. Most scouts have the Class B troop t-shirts / summer camp / fleece / hoodies to wear. When we depart everyone is back in the Class A shirts. Also good times with many calls that their Class A shirts have been stolen until someone points to the tan lump under some leaves.
My Zpacks Arc Haul uses carbon fiber stays that you flex. The arc creates an air gap between the pack and your back to reduce back sweat. It's not perfect, but much better than other packs I've used.