I must wear awful red trunks as protective clothing? (10)

I believe the answer is:

underskirt

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'protective clothing?' is the definition.
'underskirt' can be an answer for 'clothing?' (underskirt is a kind of clothing). I am not sure about the 'protective' bit.

'i must wear awful red trunks' is the wordplay.
'must wear' indicates putting letters inside.
'awful' is an anagram indicator.
'red'+'trunks'='redtrunks'
'redtrunks' anagrammed gives 'underskrt'.
'i' inserted into 'underskrt' is 'UNDERSKIRT'.

'as' is the link.

Can you help me to learn more?

(Another definition for underskirt that I've seen is " petticoat".)

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