Can I lie on the mat in jeans with a metal zipper and buttons, and with a watch on my hand?

It is better to wear something more comfortable and soft, like night clothes, but metal is not a problem as long as it is not an object or device related to your health. 

Be careful not to damage your mat with metal objects, especially if you use the Purple MediCrystal Mat or Gemstone Mat where gems are affixed with the mesh fabric. 

It might be easy to catch and tear the mesh with one’s watch band or bracelet.