YOU SAID:

wears heart on sleeve

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袖にハートをつけている

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wears a heart on one's sleeve

INTO JAPANESE

袖にハートを付けている

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wears a heart on the sleeve

INTO JAPANESE

袖にハートをつけています

BACK INTO ENGLISH

I'm wearing a heart on my sleeve

INTO JAPANESE

袖にハートをつけてるよ

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I'm wearing my heart on my sleeve

INTO JAPANESE

私は自分の心を袖に着ています

BACK INTO ENGLISH

I wear my heart on my sleeve

INTO JAPANESE

私は自分の心を袖に着ます

BACK INTO ENGLISH

I wear my heart on my sleeve