Economist Mark Perry has posted two great graphs at his blog (links to the two entries are below). But here are the graphs, They show that over time the percentage of our income that we spend on food and clothing has been falling. It looks like in 1950 that about 30% of our income went to food and clothing combined. Today it is only about 12.5%.
Here are the links to his two posts on this:
As a Share of Income, Americans Have the Most Affordable Food in World & It's Never Been Better
As a Share of Income, Clothing and Footwear in U.S. Are More Affordable Today Than Ever Before