The main thing is the context in which the logos are used. If you are
directly promoting a product and using its logo in the promotion then it
would be legal. However, you must follow the rules on how the logo should
be used (sizing, white space/clear space limits, color specs, etc.). You
also need the official vector art. Most companies are happy to provide
authentic vector logos to keep people from making substandard knock-offs and
maintain consistency in their corporate identity program.
The area where corporations will prosecute with great severity involves
unauthorized logo use for profit. For instance, if you decide to get some
Nike brand tee-shirts screen printed, sell them at the local flea market and
then pocket all the money, then Nike's attorneys would have every reason to
file charges against you ...well, that is of course if you are American.
If you run a giant clothing piracy operation in China our dopey politicians
are more than happy to look the other way.