Final answer:
In the meeting with Stevie in the cafe, David, as depicted in Donatello's sculpture, is characterized by his youth, adorned in shepherd's hat and boots, holding Goliath's sword, with curly hair and an unformed physique.
Step-by-step explanation:
When meeting Stevie in the cafe, David is depicted as wearing certain specific attire which is reminiscent of classical art, as noted in the references provided. Donatello's sculpture of David distinguishes itself by featuring David as a youthful figure, avoiding the traditional bearded image often associated with maturity. Instead, he is presented with curly hair, smooth skin, and a gentle smile, which aligns with the classical tradition. Donatello captures David's youth further by highlighting his unformed musculature and his attire - still wearing his shepherd's hat and boots. He wields Goliath's sword in one hand, while a feather from Goliath's helm suggestively reaches up the inside of David's leg. His broad shoulders and the incised detail on his skirt also contribute to this iconic statue's composition. Moreover, David is shown with broad arms and his hands clasped just below what is understood to be a central beard on formal representations, but here, it's an eased stance with the hands resting by his side.