This tells the client which items in the matching Container Contents packet to equip on the corpse

Offset Type     Name             Description
------ -------- ---------------- ------------------------------
 0000  BYTE     cmd
 0001  USHORT   blocksize        the size of the packet
 0003  UINT     corpseid         the serial of the corpse.
       loop {
           BYTE itemlayer        the item's layer (C#|VB7).
           UINT itemserial       the item's serial
       }
       BYTE     terminator (0x00)

This loop contains information about the equipment on the corpse. Exit the loop when Layer is zero.

Layer: The item's layer (C#|VB7). Serial: The item's serial.

Followed by a 0x3C message with the contents.