Boxers (and pajama bottoms) with functional opening fly for G8 and G9 Male

There are several boxers and pajama pant sets for G8 and G9 males that all have the appearance of a buttoned fly, but none of them have morphs to actually open. The only boxers made with that functionality to my knowledge are the Simply Casual Boxers for Genesis 2 males. Would love to have some updated options with this basic functionality!