I thought 4D was a typo but actually the dress shifts shape with time:

The Massachusetts-based design studio Nervous System has created an innovative 3D-printed garment that is custom tailored to the wearer’s body. It’s a part of the creatives’ Kinematic system, and they actually refer to it as a 4D-printed dress because when produced, it generates a compressed object that unfolds to its intended shape only after printing. So, how does that happen? Their smart strategy compresses the garment into a smaller size during fabrication which means that it’s made more efficiently. This also allows a machine to print larger structures than normal.

Nervous System’s dress is formed by an intricate pattern structure that features 2,279 triangular panels interconnected by 3,316 hinges. This tessellated mesh’s computer file is manipulated before printing to ensure that the garment fits like a glove.

Designers also created a smartphone and tablet app that allows for the customization of patterns, style, and flexibility. The triangles are arranged and rearranged to fit the user’s parameters, and they can see how the dress will drape on screen before printing.

Cool!