Realistically you will need to do this in post editing or with some camera trickery.
So for example you could create a separate projects where the character is posing in each item of clothing and render these to video. Then in a video editor you could use transitions such as fades and join all the clips together.
Alternatively in iClone you could have your character walk behind a dressing screen in project 1 and then have them walk out from behind the dressing screen wearing a new outfit in project 2 and so on.
Peter
Forum Administrator
www.reallusion.com