Ugly stripe concealing alien's knick-knacks! (8)

I believe the answer is:

pretties

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'knick-knacks' is the definition.
I know nothing about this answer so I can't tell whether this works.

'ugly stripe concealing alien's' is the wordplay.
'ugly' indicates an anagram (an ugly or wrong form of the letters).
'concealing' indicates putting letters inside.
'alien' becomes 'et' (extra terrestrial).
'stripe' is an anagram of 'prties'.
'prties' going around 'et' is 'PRETTIES'.

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