selected dogs jumper,inveres the selection, rubbed out the background
step 2 of 6
lowered opacity on the jumper and c/p it to the cat
step 3 of 6
used the puppet warp tool to menipulate the jumper to more or less fit the cat
step 4 of 6
had to do many tweaks using the clone stamp tool and eraser to make it look normal then i c/p the hat on the cat
step 5 of 6
pasted the cat in his new clothes into the new background
step 6 of 6
added the shadows using new layer via copy,enhance,black and white,turned off all sliders to make it black, lowered opacity, gausian blur, move tool to size and place shadow.