To NOT have this as an issue please consider going through her clothes in the Spring and the Fall and switch out her wardrobe.
This is what I do.
I have several tubs marked and set in a semi circle around M.:
Girls clothes too little
Boys clothes too little
Girls clothes WInter 2012/13
Boys clothes Winter 1012/13
The in the Fall I take the 2 tubs out for Winter and take the tape off and mark them for Spring/Summer 2013 and do it all over again. This also allows M. to cull out clothes that are too stained or worn out to keep too so you may want to have a large trash can handy too.
I sit with the entire contents of the closet, drawers, undies, socks, scarves, hats, shoes, tights, all things they can outgrow or that has a season.
I take my time and look at the tag of each garment. I decide if I think they "might" be able to wear that again the next season or if it is going in the tub for too small.
For example. My granddaughter is going from a 6/6X up to a 7 slim. I am putting all her size 7 jeans back in the Winter tub since she may have gotten taller by Fall but still be the same around. She will need to try these on when we get the box back out too. That way she won't have a lot of clothes that don't fit her taking up space.
Her shoes that are normal shoes, such as tennis shoes, boots that can be worn year round with a dress, dress shoes, etc...those stay out year round. Sandals, flip flops, open toes shoes, snow boots, etc...all go in the appropriate tub so that on a snow day you are not having an argument about them wearing sandals.
You have to be able to remember that you have done this. My friend was arguing every morning with her daughter about not wearing seasonal inappropriate clothing to school. They had complained she was dressing to hot for the temperatures in the classroom. She boxed up the off season stuff and promptly forgot about it. She never went back and switched them out....a whole wardrobe of this little girl was never worn.
You may worry that you don't know what size she will be next year and don't know what to keep or give away. Then keep it all and try it on her when you pull the tub out to switch.
Switching the clothes like this is like going shopping and getting a whole new wardrobe. The kids forget about their favorites over the months and when they see them again it's fun and exciting.
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If kids are not physically comfortable they risk having a bad day.
Heat stroke can happen to anyone.
Running in unsafe shoes is a safety hazard same as wearing flip flops in the snow is a hazard for getting frost bite.
Letting kids have that individuality within some boundaries is fine. Safety and health come first though.