Ofer-slype

According to the Old English Dictionary:

es;

ofer-slype

m. An over-garment, surplice:-- Ðæt mæssepreósta ǽnig ne cume binnan circan dyre búton his oferslipe (-slope), L. Edg. C. 46; Th. ii. 254, 10. He is ymbscrýd mid hwítum oferslype he is clad in a white upper garment, Homl. Th. i. 456, 19. ofer-slype