Fancy slipper material, that's clear! (5)

I believe the answer is:

glass

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'fancy slipper material' is the definition.
'glass' can be an answer for 'material' (I have seen 'Vitreous material ' mean 'glass' so perhaps 'material' could also mean 'glass'). I am not sure about the 'fancy slipper' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for glass that I've seen before include "Transparent stuff" , "Container for drinking from" , "Perhaps schooner" , "Transparent solid" , "Greenhouse material" .)

I've seen this clue in the Evening Standard.

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