Can you use regular cake frosting for a wedding cake?

i would say yes but to make it look good you want to first crumb coat it

so what you do is simply add a very thin layer of frosting and refrigerate

then take it out and frost it

its better this way it helps for crumbs not to come off and it looks OS much nicer

either that or

buy fondant add a very small layer of frosting to your cake and put the fondant and it looks very nice that is actually what bakers do

Let me know if this helped you out =)