The institute grants academic dress to the various grades of membership. Those who have passed the institute's graduateeship examination (offered 1952–1984) are entitled to a violet damask Oxford burgon-shaped hood. Corporate members (MInstP) are entitled to wear a hood of Toronto full shape in violet damask, lined in violet and faced on the cowl with 2"/5 cm shot crimson silk. The gown for members and those who have passed the graduateship examination is the same pattern as that used by the University of London for their Bachelor of Arts, but with the sleeves loped by violet cords and buttons, the Fellow's gown follows the pattern of the Doctor's robes of Oxford University in black with (according to Groves 2014) 4" cuffs in violet damask, or (according to the IOP website) 15 cm cuffs and 10 cm facings in violet taffeta, the cuffs slightly gathered with red cords and violet buttons. Fellows wear a doctor's bonnet in black velvet with red tassels, other grades wear a standard black mortarboard with black tassels.