De or het allweatherkleding?

The correct Dutch article is:

de allweatherkleding

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) (kleding) weerbestendige kledij

How to use allweatherkleding

the allweatherkledingde allweatherkleding
this allweatherkledingdeze allweatherkleding
that allweatherkledingdie allweatherkleding
our allweatherkledingonze allweatherkleding
your allweatherkledingjouw allweatherkleding
every allweatherkledingelke allweatherkleding
which allweatherkleding?welke allweatherkleding?
a big allweatherkleding / the big allweatherkledingeen grote allweatherkleding, de grote allweatherkleding

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).