In Elizabethan male attire, the “pumpkin” pants were constructed of two visible layers. On the outside were the panes, which were vertical strips of fabric attached at the waist band and (usually mid-thigh) bottom hems, and were entirely decorative. The individual strips of fabric were longer than the distance they needed to span in order that they would puff out and show the underlying fabric. Under the panes were the slops, which were instead of breeches, and which were intended to be puffy in order to push the panes apart so the slops could be seen. At the front was a separate piece of fabric, laced on, which was the codpiece.
The doublets were a sleeveless garment, with the sleeves being separate items which were pointed (laced) to the doublet at the shoulders. And the doublet was most definitely fastened up the front.
A good point of reference is Margo Anderson’s Historic Costume Patterns The Elizabethan Gentleman’s Wardrobe.
From the general look of the garments, the Renaissance Male Clothing For Genesis is intended as Elizabethan attire (the puffy pants are fairly restricted in both time and place—most of the rest of Europe, and a goodly proportion of the English (or at least, those of good taste) were wearing Venetian-style breeches). But the Renaissance Male Clothing For Genesis consists of a puffy set of pants with no codpiece, and with no separate panes and slops, just a single layer of fabric with wide, heavy pleats. The sleeves are integral to the doublet, and the doublet has no front opening.
No artist information is given, so I don’t know who to blame for this travesty, but surely a little bit of basic research could have been done?