De or het zomerkleding?

The correct Dutch article is:

de zomerkleding

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) (kleding) kleding die geschikt is voor warm en zonnig weer

How to use zomerkleding

the zomerkledingde zomerkleding
this zomerkledingdeze zomerkleding
that zomerkledingdie zomerkleding
our zomerkledingonze zomerkleding
your zomerkledingjouw zomerkleding
every zomerkledingelke zomerkleding
which zomerkleding?welke zomerkleding?
a big zomerkleding / the big zomerkledingeen grote zomerkleding, de grote zomerkleding

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