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The adjective Demure also describes a woman in this way:

(Of a woman or her behavior) reserved, modest, and shy: ‘a demure little wife who sits at home minding the house’; see, Oxford Dictionaries

The adjective demure also describes such a woman:

(Of a woman or her behavior) reserved, modest, and shy: 
a demure little wife who sits at home minding the house
[Oxford Dictionaries]

Demure also describes a woman in this way:

(Of a woman or her behaviour) reserved, modest, and shy:

The adjective Demure also describes a woman in this way:

(Of a woman or her behavior) reserved, modest, and shy: ‘a demure little wife who sits at home minding the house’; see, Oxford Dictionaries

(If I had 50 rep I would add this as a comment to Tushar Raj's answer as these aren't really idioms)

Demure also describes a woman in this way:

(Of a woman or her behaviour) reserved, modest, and shy:

Demure also describes a woman in this way:

(Of a woman or her behaviour) reserved, modest, and shy: