Is it possible to get the karlstein outfit without using pearls?

YES it is possible

this game have so many event

sometime u can get it with

completeting quest event
or may buy it with blackpearl

and sometime the DEV give u FREE
when u complete some event or level

wish my answer help u

thx u

You can buy outfit box using 300 bps in the shop.If u r lucky u can get it.You can also create outfit in camp and again if you are lucky u can get it after opening the box.