If one was to, hypothetically of course, allow her 3 year old to wear a football t-shirt under a sweater to church because all of his real church clothes are sitting in the pile of dirty laundry that has been collecting for 2 or 3 weeks, one should probably make sure he can't take of said sweater during the first 30 seconds of Primary.
One should also make sure the 3 year old is not called on to stand in front of the entire primary to hold a picture during sharing time, especially on the off chance that on that particular day the picture will need to be held for ALL of sharing time (about 10 minutes), not just the normal 15 seconds.
Because that would be SO humiliating to the poor mother to have her child paraded in his homeless t-shirt church ensemble for all to see. I'd fully expect an annonymous bag of clothing to be dropped on her porch later in the week by some charitable soul who witnessed the scene and thought "that poor child, can't his parents afford a shirt and tie? I'm going to make some calls- I think Sister so-and-so has a boy about his size.....". What kind of masochist mother would let that happen??
Me I guess.