Looking for a photoshop brush

You are going to create a brand new brush preset which you'll make from your t-shirt graphic.

When you use Edit > Define Brush Preset anything that is black will be included, and everything that is white will remain transparent. So:

Crop down to just the graphic, and invert it (Ctrl i)

Draw a loose selection around the text and logo with the Lasso tool, and fill with black (Alt Backspace)

It needs to be a decent size, so use Image size (Ctrl Alt i).  Lets make it 2000 pixels.

It's going to be a bit muddy after the resize, so sharpen it to firm up its outline (Use Unsharp Mask to avoid fringing).

Then go Edit > Define Brush Preset give it a name and you are done.

You can stamp that directly to your project, or you can add some settings.

In Brush Settings >> Shape Dynamics give 100% Angle Jitter

Now the brush will be rotated between every stamp down, but because you'll have probably made the brush smaller, its outline will be less jagged.

You can use Scattering > Scatter Jitter to make the brush move randomly between each stamp, but don't go too high or you'll separate each stamp down.  Use the preview window at the bottom opf the panel as a guide.

The Photoshop Brush Engine can be a lot of fun.  You can't break anything by experimenting, and it is an incredibly useful tool to have in your Photoshop box of tricks.

If you want to keep any Brush Settings you apply, you need to save the preset again via the Brush Settings pop-out menu (three bars top right corner).  That will keep it safe untill you ether delete it, or do a major Photoshop update.  Tou keep it forever you need to export it ether as a single preset, but usually as a group.

In the Brushes panel, select your new brush presets, and group them.  Give the group a name.

Select your new group in the Brushes panel, and in its pop-out menu choose Export Selected Brushes

This will save them to a .abr file that you can keep forever, or share with friends, or sell on Brusheezy etc.