There is also this:
And a knitted vest, red and yellow, which I can not find a photograph of at this point.

I wonder what one he is given to wear on the ship?

Who can tell at this point? ask again in a year!

I think he will wear both on the ship. The first photo seams to be of Eustace in Narnian clothes, the second is just his English clothes. At least this is what i think about it.

Yes, Adeona's photo looks very English 1940s, and the knitted "pullover" is very much of the same period.
(English vests are actually underwear!!)

Whoops! Thanks for correcting me!

Here is a photograph of Eustace wearing the pullover:

I believe he is wearing it over the second outfit; the English one.

Don't worry, you weren't using the term incorrectly, Adeona! Vest is a correct term, as is pullover. Though Americans use both terms, and Brits don't refer to this as a vest, neither term is the "right" one. Calling it a vest isn't wrong, and calling it a pullover is not more accurate than vest. It is a bit more specific in America, though. To be the most specific, we'd call it a pullover sweater vest.

I tend to use both terms on the costume site so as not to confuse, but I'm guessing most intelligent Brits will understand we are not trying to figure out how Eustace's underwear is knit.

Sorry, didn't mean to pick on you and say you were wrong, just to let you know that in an English film it's useful to know the relevant terms.
The kind that is sleeveless and buttoned down the front is known as a waistcoat (very Hobbity), although they are more usually woven material than knitted.

I was just throwing that comment in after confirming you were right about those clothes being English ones.

(You may, however, understand that on another thread I found it rather alarming to read that a photo was showing "Lucy in her vest" as she is much too old to be running around in her undergarment!! - not that we would allow such a thing, for either Lucy or Eustace )

I like the costumes shown in the picture very much! They're great. Hmm.... I should take Lucy's outfit into account because I'm being a pirate for Halloween. Very nice costumes! I especially love the fabric they use.