I am diving in late November in Cozumel.....I am very cold natured..which suit is best...a full 3mm or a 5mm...... I have heard that you can do a full 3mm then wear a 3mm shortie over it.......Is it really that cold that time of the year? I wear a shortie there May thru August and am a little cold..... Plus what brand? I am looking at the Henderson Hyperstrech cause the addys make it look easy to get on since it stretches so much?