I started a thread on this subject about a month ago (current;y on page 2 but here it is
Tailoring 365-375) and I got more than decent answers.
Basically, if you can get your hands on the arcanoweave boot pattern, you'll probably end up saving lots of money. Every arcanoweave boot I made gave me a point till I hit 375 (366-375, and it was yellow for at least the last 5 points). I got lucky on the drop, but as Anobix mentionned, it's not that easy to get the said pattern. It is nice, but don't run the TK instances for that purpose only, unless you have quests/need rep with the Sha'tar.