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How to dress modestly and attractively (girls )
Keep your necklines no lower than four fingers below the collarbone.
Anything lower may begin showing cleavage.
Avoid sheer materials or fabrics that sculpt your body, like spandex.

Possible answers:
[i] They can flatter you and make your body appear smaller. Don't wear clothing that shows the belly or breasts.
[ii] See below : Ensure being able to cover your entire body. Clothes that hit at the waist and rise up may be seen as immature or a mature form of modesty.
[iii] These are often considered too revealing, and onlookers may be able to see your bra through tops like these. Draw attention to your face, not your bust.
[iv] Run tights under hot water when necessary, because when you sweat, the friction slows your heart rate. Buy minimal jewelry, or avoid carrying on any heavy eye contact.
[iii]