Maybe in the US. In Germany I've been stunned at how thriving the flea market is for used clothes, especially baby and toddler clothing. In my town, there are two major flea markets on a weekly basis. Every neighborhood in town will have at least one yearly "Hofflohmarkt" (courtyard flea markets) and there are countless smaller and specialized flea markets organized by local kindergardens and churches.

The amount of high-quality pieces of clothings bought and sold is staggering. For baby clothes, in particular, pieces that have been worn once or twice, easily worth 15-20 euros selling for 50c a pop.

I compare this to the experience of my siblings raising their kids in the US and the general difference in mentality to second-hand clothes is shocking. I'll admit to being (culturally) shocked when my partner first suggested buying "used" clothes on our newborn but we've must of easily saved 1000s of Euros on children clothing, without sacrificing quality. It blows my mind. This mass flea-market system should be much more prevalent imo.