I bought the Medela Symphonie from the hospital and the bra for it, which works great. I also have an Ardo Calypso-to-go and the bra doesn't fit because the funnels on the Ardo are not removable. But I will just sew a zipper to the funnel openings of the bra so that the opening is bigger and I can use it for both pumps.

I have the bustier and an Ardo pump. It works. You just have to choke the bonnet a little through the opening.

i had an ardo pump and could not use the bra. this was because the breast cap was different and it did not go through the hole or only with a lot of choking.

I have the Medela pump myself, but I think it should work.
You put the breast cap on the breast and then the bra over it and the end of the funnel through the holes, then to the suction device.