How can I quickly do these shapes/designs in Photoshop?

If you're wanting to add symmetrical effects to an image, you could try using the Paint Symmetry feature New features summary | January 2018 and October 2017 releases of Photoshop CC​, which works with the Brush, Pencil, and Eraser tools. If you're wanting to create your own designs, you might want to look into using Illustrator for creating fashion flats. You could also do a combination of the two. Use Illustrator to create the shapes, import that into Photoshop, then adjust the design depending on what the base image is (probably it would be best to start with an image of a white garment and use the multiply blend mode to apply the design).

Hi

You are going to have to make the shapes and patterns in whatever software you choose. You can make one side and transform a copy so that the design is symetrical.

You need to address the way the pattern is applied to the folds though. On the sleeves the pattern is not following the creases and folds.

There are a few ways to address that :

1. Bend, warp and split the pattern to make it fit the image.

2. Use a displacement map to automatically bend the pattern

3. Get a 3D model of the coat (or make one in a 3D app) and apply the pattern in 3D as a texture

Dave

shapes can be done using pen tool but better choice is ofcourse adobe illustrator

If you want to do you own design AI would be better than Photoshop for that job.  If you want to create a template mockup for Photoshop where you can insert you design into the mock.  There are many t-shirt type mockup template on the web for use with Photoshop. Some are even free.

This looks like a better job for illustrator, but you would have to draw the shapes out either way

You can do one side then mirror the other side