cutaway
US /ˈkʌt̬.ə.weɪ/
UK /ˈkʌt̬.ə.weɪ/

1.
a garment, especially a coat, cut so that the front slopes away from the waist
:
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He wore a formal cutaway to the wedding.
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The tailor specialized in bespoke cutaways.
2.
a model or diagram that shows the internal workings of something by having part of the exterior removed
:
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The museum had a cutaway model of a jet engine.
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The instruction manual included a detailed cutaway diagram of the device.