I'm 5ft 3" and a size 10 I have an entry level orca suit in a size small which I love and fits like a glove. Although when I first tried to get it on I put it on backwards and then I was sweating so much I couldn't get it to go on at all!!!
So the next day I tried again however this time armed with a 1 quid pair of primark wooly gloves and hey presto I was able to pull it on properly without damaging it. This makes sure that you can get the crotch right up and the torso pulled up so it doesn't pinch around the chest and neck.
Also the tip from above is great once it is on if you lean over and grab the excess neoprene and give it a good pull (with gloves on).
They do loosen off abit when they have been worn in the open water a few times. Also abit of body glide around the ankles and wrists helps it on.
Hope this helps. Open water swimming is so awesome so bare with the suit and take the plunge!!!
Definatley go for start fitness! They were in Eldon Square but I think they may have to the monument. I have actually moved to Yorkshire but always travel back to see my folks in Newcastle or go to start fitness shop in Durham. They do gait analysis for free and staff are very very helpfull, I always spend loads of money. Hope this is helpful. I won't buy from anywhere else.
Read your thread and had to reply. My dad has been diagnosed within the last year with primary progressive MS and has gone from bad to worse. It has been a huge emotional strain on all of my family, it was something that we just didn't understand and has changed all our lives. But now I have started researching it and starting to understand it a little bit, it is fantastic that you are able, and keep running. I wish you the best of luck in your running and good health.