Sports bras make you look flat chested?

Anonymous
When I wear a sports bra it flattens my breasts which I thought it was supposed to do. But lately I have seen some women who are obviously wearing a sports bra but there boobs are not flat and look more like they are wearing a regular bra. Are there sports bra that don't flatten them and still work to keep them supported? Or do these girls have fake boobs and that is why they don't flatten? I am a D size cup so I am not flat chested.
Sports bras make you look flat chested?
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