These products became an icon of 1950s rebellion when Marlon Brando wore one in A Streetcar Named Desire.  
A popular brand of these products in the 1930s were named after "gobs", a slang term for some members of the military.  These products became much more customized in the 1960s thanks to the development of the Plastisol transfer process.  Margaret Wanjiku, who sells some of these products in Kenya, was interviewed in an episode on the "afterlife" of these things made for a bat mitzvah, part of a (*) Planet Money series on making them.  They were legendarily invented to prevent Queen Victoria from becoming disgusted at the tattoos on the bodies of British sailors.  The "uniting" power of these products is celebrated in the slogan for CustomInk.  These products became an icon of 1950s rebellion when Marlon Brando wore one in A Streetcar Named Desire.  For 10 points, name this ubiquitous type of clothing, which might be tie-dyed or screen printed.
A popular brand of these products in the 1930s were named after "gobs", a slang term for some members of the military.  
t-shirts [or tee shirts; or tank tops; or wife beaters; or a-shirts] 