The First Rule of Flag Etiquette (for me anyway) is that our flag should not be clothing or decoration. I will not buy any clothing decorated with representations of The American Flag. After 9/11 there was a sudden upsurge in the display of things red, white and blue, as if that in itself indicated patriotism. I have noticed at the same time a great deal of (probably unintentional) disrespect to the symbol of our country. Since Patriotism begins with proper respect for our symbols,
Don't buy or wear clothing decorated with American Flags.
Display Flags at home in the proper manner. (lowered at night or properly lit, and in good condition)
Display flags on your car properly. (The proper way to fly a flag is from a sturdy rod attached to the right front corner of the car. The plastic rods that clamp in the window eventually break and the flag ends up in the gutter. No widow decals. Bumper stickers are OK.
These are not my rules, there are more. try Googling "Proper display of the flag". Patriotism is in your heart, not on your clothes.