I have purchased several items online that way. It helps, since most kids outgrow their clothes. On the other hand, some people expect to buy things for free or close to it, and are sometimes reluctant to buy them that way.
I have had both experiences. Some things sell like hotcakes, others not so much.
I have noticed that “designer” clothes seem to be real popular. For myself, having a baby, I could care less that he is wearing the “popular” designers. As long as it is in good condition and well made, I am happy.
He grows so fast, he will not wear it for long, so I don’t see the point of dressing him in “designer” name clothes and paying retail or near retail prices for them.