Get kneepads sewn on by a suit maker, who will also seal the stitching. You don't want to glue the patches on as they'll stop the knees flexing properly. All my drysuits (3 of them) had kneepads from new.
Polarised sunglasses should actually be called polarising sunglasses, and if you want to understand how they work I suggest you look them up on Wikipedia. What they do for you is that they greatly reduce reflected glare, which when you're looking at the surface of water can often remove the surface reflection and allow you to see the bottom. Very popular used as filters on SLR cameras (and on those rare compacts that have a means of attaching a filter).
I can't believe there's anyone who hasn't heard of polarising sunglasses!
I stick to what I said earlier about suits. If you get cold then take a drysuit (with undersuit), or you'll be miserable after your first dive of the day. If you don't know how cold you get then start comparing yourself with other people in normal life, noting what you wear to feel comfortable compared with other people. If you decide to use a drysuit make SURE it fits you properly, especially that the integral boots are not too big and the legs aren't too long, and of course get good training.
Polarised sunglasses should actually be called polarising sunglasses, and if you want to understand how they work I suggest you look them up on Wikipedia. What they do for you is that they greatly reduce reflected glare, which when you're looking at the surface of water can often remove the surface reflection and allow you to see the bottom. Very popular used as filters on SLR cameras (and on those rare compacts that have a means of attaching a filter).
I can't believe there's anyone who hasn't heard of polarising sunglasses!
I stick to what I said earlier about suits. If you get cold then take a drysuit (with undersuit), or you'll be miserable after your first dive of the day. If you don't know how cold you get then start comparing yourself with other people in normal life, noting what you wear to feel comfortable compared with other people. If you decide to use a drysuit make SURE it fits you properly, especially that the integral boots are not too big and the legs aren't too long, and of course get good training.