Breasts seen through the armhole or sideviews, like with aprons, etc ... These may also be known as sideboob shots
Armhole view, with a bonus downblouse view …
Sideboob shot of the maid …
Sideboob shot at the beach …
Double bonus … two tits seen through one armhole …
ARMHOLE/SIDEBOOB #3 - Hot Picks

Some of the best armhole/sideboob shots on the web:

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Nice armhole view …
latinababes2:

Karla Spice shows some sideboobs in her jean jumper …
Wicked sideboob shot …
Most excellent armhole view at the restaurant …
gogopornville:

Taylor Momsen - The pretty reckless
Concert? What concert? Just enjoy the view …
Overalls reveal sideboobs …
awesomechicks:

Tenishia McSweeney
pokies-nips:

can hardly contain herself…