Well, I have never seen these mentioned before on MDC but since I own 2.5 dozen I should probably share my experience...
There are 2 kinds, Baby Softwear and BabyLove, made by a Canadian company now called Kidalog which also sells the pattern. Both types are made of cotton flannel, have a floating panel to dry more quickly, are OS, and Velcro close. Baby Softwear has the panel attached in the back & elastic across the back; BabyLove has a longer panel attached in front & no elastic in back.
BS was very adjustable, with a fold-down front that wasn’t too bulky on a smaller baby. They were too big for nb though. We used them with cheap fleece liners and they were easy to clean, no special washing. We dried them on clothes hangers with those little skirt hangers added – saved a lot of space on the line. They were really soft and fluffy, even after the fuzz came off, and still are not completely dead after 2 babies. The diapers fit in all the covers we tried (not many). Drawbacks were the maddening Velcro which stuck to everything and could be scratchy when coverless.
BL’s panel seemed too long to fold up easily & the diaper didn’t fit so well. We only had a couple of them and they were always bottom of the heap.
The BS are inexpensive, sturdy, and easy to use. They were a great start in CD for us, but then I’m no hyena!