After asking for the sword, the Warlord nods his head and motions for you to pick up the sword. Lifting it, it occurs to you, being a large gnoll, that the sword does not change size and would not work as a great sword for you. The same is true of your brother who went to train without the warlord.
Looking at the other items: the armor, bow, and the arrows do not change size. The straps, the necklace, the helm and the bracers do change size.