How to smoothen cloth with pattern on photoshop

No easy way to do this that I can think of.

You could create a pattern and use it to fill the area.

Select a portion of the fabric that is fairly uniform. If it isn't uniform enough, touch it up so that there are no obvious variations.

Select Edit > Define Pattern.

Make a selection of the area you want to fill.

It would be a good idea to create a new layer.

Then choose Edit > Fill. Select Pattern from the dropdown list and scroll to your new pattern at the end of the pattern list.

Hi

A combination of :

a. Frequency separation cloning the low to get rid of the shadows and the dreadful moire colouring

b. Spot healing to take out the stripes

c. A white brush to paint in new stripes

d. Cloning the edge on the high frequency layer

The reality though, if you have a few of these o do, is that rephotographing them carefully will save a lot of time in Photoshop

Dave

To remove wrinkles from clothing, use Frequency Separation. See video.