If what you are really talking about are Flotation Suits, be cautious .
Flotation suits are absolutely no substitute for a life jacket and also have a very limited protection against hypothermia.
They do give good protection against cold water immersion shock and are nice and snuggly to wear while you are still aboard your boat ! They are fine once you do not over estimate what they are!
We had a tragedy over here a few years ago where 3 fisheries officers who were wearing flotation suits but no lifejackets died of hypothermia within 3 hours when their patrol boat sank off Ballycotton off of the South Coast on a fine summers day in August abot 14 years ago.
The Ballycotton inquiry report while quite basic and simple in its stark findings on the tragedy is now the bible for those of us involved in operational boating for the state ; particularly when the office boys try to cut back on spending on safety equipment !