Here's a short story:

CHAPTER XXIV 

TOM CARRIES A LETTER 

After that it was a comparatively easy matter to get the old man to talk, and he told James Monday and the boys practically all he knew about Sack Todd and his followers. 

He said it was commonly supposed that Sack Todd had some invention that he was jealously guarding. Some folks thought the man was a bit crazy on the subject of his discoveries, and so did not question him much concerning them. The machinery and other material which arrived from time to time were all supposed to be parts of the wonderful machine Sack Todd was having made at various places. 

While he was talking, the old man looked at Tom many times in curiosity. 

"Might I ask your name?" he said at length. 

"What do you want 'to know that for?" returned Tom. 

"Because you look so wonderfully like my son Bud--an' you talk like him, too. But Bud's skin is a bit darker nor yours." 

"My name is Tom Rover." 

"Talking about looking alike," broke in Fred. "There's a strong resemblance," and he pointed to the detective and the old man. "Of course, you don't look quite so old," he added to James Monday. 

"I am glad that you think we look alike," smiled back the government official. "I was banking on that." 

"What do you mean?" came from Songbird. 

"I will show you in a minute. Mr. Cashaw, I'll trouble you to exchange hats, coats and collars with me," the detective continued, turning to the old man.  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Who was talking at the beginning?
Guess: the old man

Question: Who did he talk to?
Guess: James and the boys

Question: Who did he talk about?
Guess: Sack Todd and his followers

Question: What did Sack Todd have?
Guess: an invention

Question: Did he share it freely?
Guess: no

Question: What did people think of him?
Guess: he was a bit crazy

Question: What showed up occasionally?
Guess: machinery and other material

Question: Did the old man acquainted with Tom?
Guess: no

Question: What's his last name?
Guess: Rover

Question: Who does he look like?
Guess: the old man's son

Question: What's his name?
Guess: Bud

Question: How do he and Tom differ?
Guess: Bud's skin is darker

Question: And the same?
Guess: Tom looks and talks like him

Question: Do they seem to be the same age?
Guess: no

Question: What is Tom's job?
Guess: detective

Question: And James?
Guess: government official

Question: What does tom want the old man to switch?
Guess: clothes

Now answer the following question in the same format.

Question: Which ones?

hats, coats, and collars