Final answer:
Prince Henry expresses his feelings about Poins by condescendingly mocking Poins' possessions, indicating a disdain for his lower social status and wealth.
Step-by-step explanation:
The detail that best shows Prince Henry's feelings about Poins can be understood considering his condescending tone towards Poins' possessions and lifestyle. He mocks Poins by mentioning his silk stockings and the lack of shirts, evidencing a disdain for Poins' lower status and material wealth. The prince reflects on how demeaning it is for him to even remember such trivial and petty details, pointing to a larger commentary on the superficial nature of status and materialism.