I sense a true newbie. I was there not so long ago so I can empathise with your predicament. Also, welcome to Allakhazam.
You've reached the maximum for your skill level, as you have realised. You need to visit a trainer to learn the next level of tailoring, which will increase the limit to 150.
If you have time, you might want to read the FAQ at the top of the Trade Skills forum. There's a lot of worthwhile information in there.