I think we shall have to appoint some delegates to go to the exhibition at the Palace, to see these exhibits for us and report back.

The Crown Jewels 1998 has a summary of the overgarments in The Textiles Catalogue in Volume II.
The robes now in the Jewel House are -

* a tunic, 1911 (Supertunica) 55 inches neck to hem
* the stole, 1953, 85 inches long, and
* the mantle, 1821, 117 inches in height of front edge

all of cloth of gold.
Another very similar mantle was made for Queen Victoria, and another for Edward VII had an embroidered pattern instead of woven.

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Edit: Those were needed to be made because the original was a "perk". From the Royal Collection link Baxter provided -
After the coronation of George IV the Mantle became a perquisite of the Dean and Chapter of Westminster Abbey, and it was passed down to a private individual. Eventually it was returned to the Crown in the early 20th century and it was subsequently worn at the coronations of Kings George V and VI and Queen Elizabeth II.
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After the Anointing, the sequence of robing is, and at intervals -
* the tunic (known as the Supertunica because worn over a linen under-tunic known as the Colobium Sindonis
* second, the stole round the neck and
* third, before the crowning, the mantle variously known as the Pallium, Imperial Mantle, and Dalmatic.

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Edit: the sequence must be Colobium Sindonis, supertunica, stole, mantle.