I've seen or used several variations of these suits while working with several different Ice & Cold Water Rescue units.
Several different types are used by shore crews as a safety matter. There are 2 main manufactures out there with quality products. They are fairly comfortable to wear and work in but can be a bit pricey. Here are the manufacturers, style and prices I got from our present supplier.
Sterns: Suits: $320
Parka: $160
Jacket: $ 135
Mustang Survival: Suits: $325
Parka: $126
Jacket: $135
These are just an idea of prices, alot is based on the extra you can get like d-rings, extra pockets, ect., and sizes.
Hope this helps.