This is the 10356th most frequent Polish word.
cieplejsze
"Warmer" (comparative form of "warm").
The word 'cieplejsze' is the comparative form of 'ciepły' used to describe the increasing warmth of days.
Wiosną dni stają się cieplejsze.
In spring, days become warmer.
Here, 'cieplejsze' emphasizes better suitability of the clothes for cold weather.
Czy masz cieplejsze ubrania na zimę?
Do you have warmer clothes for the winter?
'Cieplejsze' compares the warmth of places, implying better comfort.