Blue jeans weigh from 12-16 ounces, and t-shirts half that amount, and dead loads take up to a year to cause a collapse. So, I'd say that if you normally keep 80 or so pairs of pants and 80 or so shirts stacked on that dresser for 12 months at a time, then you're good to go.
But if you meant 5 shirts and 5 pairs of pants for a few weeks, then I think you've only proved that a half gallon is safe.
Dressers just aren't built to be tables, since people don't buy them or use them as tables.