If you have the below RST jacket then I would check the stitching. I bought this jacket with matching bottoms a month ago and I noticed on Monday that the there was a large hole under the reflective piping where the right arm is stitched to the body of the jacket.
I had to get the bus to work yesterday and my wife took the jacket back to the shop. The shop were really good and exchanged it for another. I got home last night gave the jacket a look over before trying it on and it had a hole in the same place!! The hole was much smaller and you had to move the piping to one side to see it but it must be a fault in the jackets.
I am on the bus again today and my wife has just been to the shop who changed it again for another style RST jacket, they are going to check the rest of their stock and contact the distributors Moto Direct.