Jeans are worn lower so the waist location for the jeans is probably different to where you are measuring your waist using the tape.

Secondly a jeans that says waist 34 is a finished waist 36 (its called vanity sizing).

So your waist where you wear the jeans is 36 from the body therefore do not use your pants measurements for ordering kilt! 

I wear a 34 in Levis but my kilts range from 36-39 inches, depending on where I wear it.

If you send us your jeans waist size your kilt won't fit and you'll be a sad panda. :-(