He has too much crop top showing compared to the prototype photos:
With the actual costume there was sometimes hardly any skin showing at all between the corset and armoured vest, as the gap was covered by a little of the fabric from his cropped shirt:
Other times the shirt doesn't show at all, and the corset touches the armour in the middle:
On the bike it looks like there's more separation between the armoured parts:
As with Premier's Immortan Joe he's going to need some futzing. I presume the two parts of the corset are a single mould, so can't be separated to cover more of his torso.
A compromise would probably be to push the shirt up under the armour and allow more flesh on view.
Premier did the same thing with Max: made his jacket too short and filled the gap with a longer shirt. He only came together after being put onto a smaller body.
EDIT:
Checking CelebHeights Vernon Wells is estimated to be 5' 10 ½" (11 3/4" in 1/6), so a body with s shorter torso might work.