Good thinking aiming to take it on as hand baggage; there’s someone else on here who still needs to learn that lesson 😉
Suit carriers are (in my experience) a waste of time. Much better to learn to fold stuff to minimise the creasing. Also, some suits and shirts ‘travel’ better than others.
I’m not a great fan of wheelie bags myself, partly because they get in everyone’s way and partly because they result in you packing everything flat, then tipping it on its end. For me I use soft holdalls; these you always carry and store upright, in the same orientation as you pack. If you do this there’s no need for any elasticated retaining straps. Don’t ram stuff in either, I aim for about 75% full maximum.
I say this as someone that travels frequently on business, sometimes involving more than 24hrs travel time. Hanging stuff up in the bathroom whilst you shower is also a good way to get light creases to drop out without any effort.