Identify, quote, and explain lines that fit in with the clothing motif in scene 4.

There are numerous references to clothing in the play.  I
assume that you mean Act II, scene 4 which occurs after the murder of King Duncan.  The
robes referred to by Macduff are the robes of office, in this case the king's robes. 
Interesting enough, when Macbeth is greeted in Act I, scene 4 by Ross, as the Thane of
Cawdor, he asks,"...Why do you dress me /In borrowed
robes?"

There is a certain irony in Act II, scene 4 when
Macduff tells his kinsman, Ross, "Lest our old robes (Duncan) sit easier than our new
(Macbeth)."

Is Macduff being cautious or does he already
suspect that all is not what it seems to be?