The most basic structure of a sleeve follows this pattern: the sleeve is not separated from the main body, and a single large piece of fabric is cut to create this form.

While striving to create a sleeve structure that seamlessly conforms to the body, ensuring both form and function, the resulting pattern takes shape as follows

Comparing these two silhouettes, sleeves with gussets underneath create a sleeker impression with less excess fabric around the underarm area. This design choice yields a more refined and tailored look.

Further evolving towards a silhouette that perfectly conforms to the body, the structure takes on the following form:

By replacing the underarm gusset with a panel integrated into the body, this design achieves a structure that not only preserves freedom of movement but also enables precise control over the body's silhouette.

Designing sleeves as three-dimensional sculptures requires seamlessly integrating design and pattern. This example demonstrates how form and function can harmoniously coexist.

Additional sleeve structure variations can be found on this page.

https://themodelistearchive.com/sleeve-pattern/kimono-sleeve