When something is upside-down or wrong-way-up, the part which is usually at the top is turned to be at the bottom.
The house is upside down / wrong way up.
When something is wrong-way-round or back-to-front it is facing the wrong way.
He is wearing his suit wrong way round / back to front.
When something is inside-out, it has the usual inside part on the outside and the usual outside part on the inside.
The jeans are inside out.
