Err......A suitcase? Or you could of course wear it.
We pack my husbands suit and dinner jacket in the suitcase, with the jackets in a polythene suit cover to avoid creases. You could use a suit carrier but it would need to be very substancial as it possibly have to go in the hold as the size would be larger than hand luggage.
Excuse my friend, the men with the white coats will catch up with him soon...... I am assuming that you mean as "checked luggage" and not "hand luggage". If that is the case, excuse the pun, then it really depends with whom and where you are flying. Scheduled flights to the USA often allow two cases and I use a suit carrier as one of my pieces and find that everything arrives in good condition with that. If you only have one suitcase allowance then get the largest that one is allowed to take and put your trousers in the bottom of the case and fold as near to the top as possible, the jackets I find better as a top layer(s) kept unfolded if possible with the arms folded in and down (as in a coffin) preferable with tissue paper separating the jackets. Some people recommend rolling the items up but I have never fancied this method. If clothes are creased when you unpack get the bathroom nice and steamy and hang things in there for a while, that normally does it or if you're posh, have your butler do it. Hope that helps. ... Neil.