Pass colonists in winter clothing (3,5)

I believe the answer is:
ski pants
'pass colonists' is the definition.
The definition suggests a plural noun which matches the answer.
'winter clothing' is the wordplay.
'winter' becomes 'ski' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'clothing' becomes 'pants' (pants is a kind of clothing).
'ski'+'pants'='SKI PANTS'
'in' is the link.
Can you help me to learn more?
(Other definitions for ski pants that I've seen before include "Garments" , "Trousers" , "Winter sports wear" , "Gear employed descending mountain" .)
