Meaning
To fit like a glove
Example
Aquele vestido caiu como uma luva nela, parecia feito sob medida.
That dress fit her like a glove, it looked tailor-made.
Origin
The image speaks for itself: a well-made glove follows every finger and hugs the hand exactly, with no gap and nothing to spare. To say something "falls like a glove" (cair como uma luva) is to say it fits that perfectly.
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More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity