I still don't see it. Yes, loose and baggy was common, I have handled dozens of those Victorian bloomers, but these are more than just baggy, and I have never seen anything like these. The drawers in the Regency photo shown are not like these she is showing us. The pair on the left has a super large waist and are so are large and baggy all over, that makes sense (but still, no weird flap). The garment she shows has a small waist (25"), so why all the added volume in the center front? The waist size should somehow conform to the bagginess, to some degree, I would think.
And oh my gosh, if all that extra hanging flap/volume was in the back, that is even stranger (to me).
Perhaps these had some special purpose, is all I can think of. Pehaps some extra protection was needed, or extra modesty for some occasion or purpose? Or am I fantasizing? I am adding this to my garments of mystery list!!
Thank you for showing us these. And thanks Nicole for those photos, I especially love the drawers on the right, with the lace up front!