De or het herenkleding?

The correct Dutch article is:

de herenkleding

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) kleren die speciaal voor mannen is gemaakt

How to use herenkleding

the herenkledingde herenkleding
this herenkledingdeze herenkleding
that herenkledingdie herenkleding
our herenkledingonze herenkleding
your herenkledingjouw herenkleding
every herenkledingelke herenkleding
which herenkleding?welke herenkleding?
a big herenkleding / the big herenkledingeen grote herenkleding, de grote herenkleding

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