If the clothing item has the morphs that you want to use on a Vicky, then it is just a matter of dial-twisting to make it look more-less good. But if Victoria 3 has some custom created body morph (like Blackhearted's GND2 or As Shanim's Kielo) it is basically a pretty different figure, not entirely V3 anymore.

In this case Wardrobe Wizard is the easiest option. You can also try out DAZ's Clothes Converter or The Tailor, many people like them too. Unfortunately I cannot tell you which of them is the best option.

You can always try the longer but cheaper road of using poser magnets (or D|S D-Form plugin) but it's not the easiest way :)

Hope this helps :)

Michal
4blueyes