In reply to silhouette:
They are only suitable for 'normal climbing' on second, if you lead wearing them, your belayer might get a glimpse of your 'johnston'. If wowed over, (belayer) might let go rope or pay out too much slack, endangering you(leader) and increasing distance you might fall.
Thet are perfectly suitable for late season ice on the Ben, under salopettes (on lead or second), though can be awkward to pee whilst wearing them, sallys, under harness!
Stuart