A hooded vest is a must if your going to be doing 18 deg C dives on a regular basis. For me gloves aren't really important, I'm use to working without them in 50 deg F water. Also you'll probably be a little chilly and I get the correct suit for you if your going to be diving on a regular basis. I believe 18C is around 65F and I wear my 7mm for those temps, usually without a hood.