Choosing the right wedding dress entails appropriateness for the type of ceremony you have planned and the right cut for your figure, and must take into consideration the bride's personal taste and preferences.
Summer camps have one set of standards, religious organizations may have another, and parents have to decide on a level of appropriateness that is right for their daughters.
You can guide the selection for age appropriateness, but your child will be much more likely to be engaged in the learning opportunity presented by the project if he chooses on his own a project that interests him.
Age appropriateness - Just because a toddler has progressed past the point of putting everything in his mouth--which he probably did as a baby--doesn't mean that you should throw caution to the wind.
At the same time, there was a peculiar appropriateness in associating the Sabbath with the doctrine that Yahweh is the Creator of all things; for we see from Isa.