I would think that the slip material would not last long with the underwire poking it.
I have had to repair my share of bras! lol One thing I have found is that once you have
to repair a bra they don't last long after that. The wires always poke through the repairs.
I have had a couple of bras that the underwire was REALLY sharp! I wondered why they don't
sand the wires then put the plastic top on them.