Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: The relevant information to answer the above question is: The Hatter introduced in Carroll's Alice's Adventures in Wonderland wears a large top hat with a hatband reading "In this style 10 / 6".
The question and answer:
The Hatter introduced in Carroll's Alice's Adventures in Wonderland wears a large top hat with a hatband reading "In this style 10 / 6". This is the hat's price tag, indicative of The Hatter's trade, and giving the price in pre-decimal British money as ten shillings and six pence (or half a guinea).

What is written on the mad hatter's hat?
The answer is In this style 10 / 6