Sorry for the late reply.
Yeah sorry the video seemed abit all over the place.
Basically yes, I was using different assets and different bones on the skeleton for each animation.
I have been told by a friend today that, when coming to exporting for use in unity this could cause a problem and that I should have 1 bone set for the 'dress' and use different slots to change in and out the image.
My reason to making new bone sets (with different dress image assets) is because it generally looked nicer and found it easier to animate with.
I'm a 2D animator and not at all a coder or have any knowledge of unity yet, so I'm guess working my way at the moment just creating the animations.
This is causing me problems now ๐
Will be interested in the replies!