actually i haven't even check to see if i do loose all the INT i stacked as an ACN when i switch to my THM. T.T i should know right...

but no, you can't wear your lvl 15 gear on your lvl 1 LCN. lvl difference. but yes, you can wear your lvl 15 gear when your lancer reaches lvl 15. unless you crossed a mage class, and your stuff is specific for "disciples of war" not "all classes".