OKAMOTOA - you dive similar water temps as us here in WI- so, this is kinda of a easy answer for you. Get a 5mm Open Cell Interior/ Nylon Exterior - 2 piece with attached hood. You should be able to use it all year long. In the summer if the water is getting too warm you can, just not put your hood up and always make sure you are staying Hydrated. This suit should allow you to swim in water as cold as mid 30's (F) for a couple hours. A Custom fit suit will keep you warmer in colder water- but cost a little bit more.
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