If your visiting the track, you need a full set of leathers, gloves and boots. 2 piece suits need to zip together so when you crash, the seam between the two pieces doesn't fall apart. You also need a full-face helmet with visor that can be closed.
Usually leather isn't the best thing to wear when touring. I actually much prefer lighter materials when going on long trips. I bought a nice alpinestars dry star suit for traveling purposes. Normally when touring you want something water proof and that breathes to keep you cool. These suits don't work on the track, they're not designed for high-speed crashes. If you have a leather jacket already, adding a set of pants is what you'll have to do for the track and then for touring, buying something lighter weight. Its very hard to get 1 set of gear that works for both purposes, unless you're OK with wearing leathers all the time. After buying that dry star suit, I won't go back to leathers on the street, that thing is so comfortable and has lots of protection built-in.