Breakdown of kono seetaa ha atatakai desu.
ですdesu
to be
はha
topic particle
このkono
this ... adnominal
セーターseetaa
sweater, jumper
暖かいatatakai
warm
暖かい is a mild and comfortable warmth, and can be used for weather, for object that make you physically warm such as clothes and blankets, and also for things that make you metaphorically warm such as a song.
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