I'm pretty frugal for baby clothes because they won't wear them for very long (my son grows like a weed and is in 9m clothes at 4m). As I said, I generally seek the following when I buy clothes for my children:
soft, breathable fabrics with a little stretch
lightweight closures: zippers, snaps, Velcro – NOT buttons in general for stains that you need often
Fun patterns, prints or applications that will not be horrible to coordinate with other items. For babies, I love one of the clothes with the decorated foot <3
When my daughter has grown older, the threshold "per article" has become higher because she will wear some things for a year. I usually spend $ 20 + on a dress, but I usually don't make shorts for more than about $ 8, because we can only spend a few months. I'm also great at buying used and hand-downs from cousins and friends, which helps keep clothes under control.