Angelina who made these special panties?
My mother modified some normal ones from the shop.
I think it would be difficult to not make a mess. It's not that you have unlimited space to get everything out of place between the chain and the secondary shield and the general issues with peeing with the secondary shield.
The modified pants are ok so far, not perfect and time consuming but at least it's not to cold outside and I can go to toilet without additional problems except some more needed time. At lunch break I decided to remove the pants and bring them back in place before I leave (what I do now 🙂 ). So far it looks like they are ok for walking outside but it is easier when you remove them when you know you will be inside for a long time.