2 Verbs to Use for the Word armholes

Mr. Spragg heard her out in silence, pulling at his beard with one sallow wrinkled hand, while the other dragged down the armhole of his waistcoat.

I hardly know whether in later life we feel grief so deep when a colleague plays us false as we have known, you and I, on detecting the mocking smile of a gaping seam in a shoe, or hearing the armhole of a coat split, I drank nothing but water; I regarded a cafe with distant respect.

2 Verbs to Use for the Word  armholes