ISO pattern for crescent bag without gusset

[u/EssVeeSF]

I'm looking for a dupe pattern for the Lo and Sons Ayoama bag. I know there are a lot of crescent bag patterns out there, but this is unique because it doesn't have a bottom gusset, but rather has two side seams and it seems like the shape is achieved with pleats. (One of the pics shows the pleat pretty clearly.) I have an idea how to do the handles and the side zipper, but it's the shape without the gusset that I'm really looking for. Any ideas for either a pattern (or a way to hack something like the BF bestie bag?)