Organic base body sculpt in Zbrush

Cloth Patterns created in Marvellous Designer

Trousers and Top
UVs
Gloves
Ballistic Vest

Simulated cloth exports triangulated from Marvellous (with great UVs)

Using Zremesher (Frame Mesh before) one can remesh the 2D export version of the cloth patterns into quads (losing UVs)

You can transfer UVs in world space between the two 2d patterns and
after that transfer the vertex position of the 3D triangulated version to the quad 2d pattern so it wraps nicely.
(It is the so called „Killer Workflow“)
Gun created with Maya and Zbrush (leveraging PolyGroups) and textured in Substance Painter