Welcome to the Cake Decorators Q&A
How do I directly make plaid pattern on cake
Hi Urvi8780
There are a few ways of achieving the pattern. The easiest way would be with printed edible icing sheets. which can be purchased online. Here is one supplier:
https://www.rainbowsugarcraft.co.uk/Edible+Tartan+Sheets/0_CAAA833_CAAA826/PRAD026.htm
See other suppliers in google search for edible plaid or edible tartan.
Another way is to use a stencil like this:
https://evilcakegenius.com/tartan-3-color-mesh-stencil-set-large.html
Again, see other suppliers in google search.
Take a peek here too for more suggestions:
If you have an edible icing printer, it is also possible to print off the paid pattern on wafer paper then make it into edible fabric using flexique. There are a couple of tutorials on how to use the product on youtube.
https://www.thecakedecoratingcompany.co.uk/tools-equipment-c28/cake-decorating-baking-tools-c63/flexique-multi-purpose-edible-fabric-mix-78g-p8500
Hope you find the suggestions useful.