Pinstriped trousers tutorial
This tutorial is for Photoshop 5.0, but works in other versions of Photoshop as well.
 
1. Start with a pair of trousers. 2. Create a new layer and draw a stripe following the direction of the leg. I've crocked the line where the folds are to give the line a bit more depth. 3. Duplicate the layer as many times you need in order to fill the whole leg. I've chosen a 2px space between the lines. Merge the striped layers into one layer.
     
4. Repeat the procedure on the other leg on a new layer. 5. Remove any stripes that are double. 6. Merge the two layers.
     
7. Go to the trousers layer, use the wand tool to select the area outside of the trousers. Go back to the stripes layer and clear the selected area. 8. Use the wand tool again, hold Shft + Ctrl and click the stripes layer in the layer window. This should make the stripes selected. Keep the selection, delete the stripes layer, go to Edit > Copy Merged and then Paste. This should give you a copy of the stripes from the trousers layer. 9. Brighten the stripes by going to Image > Adjust > Brightness/Contrast changing the Brightness to +20 and Contrast +30.
10. Instead of doing step 9 you can set the layer to Dodge instead to give the stripes a shinier look. 11. Without the zoom-in. (Dodged layer version to the left)