Plaid patterns are special and you can't wear them with just anything, at the risk of fashion faux pas!
The most common association is, as you probably guessed, plaid and flannel, and this on a shirt, or a jacket.
Beware of the colors and the complexity of the patterns that can quickly be too much, especially at a time when minimalism and sobriety are in order. Do not hesitate to associate it with a second monochrome garment, in a complementary color to the basic colors of the plaid and with a simple shape. This will balance with the complexity and dynamism of the plaid.
After that, you are free to opt for eccentricity and to test the combinations that you like the most. After all, the important thing is that you feel good in your outfit.