So I bought aquaseal and neoprene tape. Not sure how well that would work for such a large tear. I also have tear aid. Maybe I'll give the aquaseal a go. Not sure about the tear aid yet. Thanks for your replies.
Aquaseal is AWESOME !!!
If you have never used it before - you have to be aware that it "runs" like hell many hours after applied, so you should lay the suit/stitches out perfectly flat.
Then apply the aquaseal around the stitches (on the inside) so it will be fully covered.
The stitching actually looks quite good - so you just need a flexible strong adhesant glue - and NOTHING beats aquaseal (or aquasure - same thing).
You could also put a bit of the aquaseal on a garbage cloth, just so you know how much it will flatten out and run...
It takes 24 hours till cured, and wait a couple of days before you use it.
IF, it does not work, you can always glue (with aquaseal) the neoprene tape on the inside over the stitching - this will work too but a bit more overkill maybe ?