Big help: So Science Fair Help? - Help.com

haha, ok so when you do an experiment; you can only test one thing at a time. So you have to either use one type of lighter or one type of clothing.

What you need is a hypothesis: what do you want to test? You could for instance ask yourself whether more expensive clothing is also safer to wear. One hypothesis would then be that more expensive clothes are safer, another that there is no difference, and a third that more expensive clothes are less safe. If you were to do this experiment, you’d already have two variables: price and safety. Since you are looking to see whether these two are related, it would be best to keep all other variables the same: get clothing that’s as much alike as possible in model and colour, use the same way to inflame them, et cetera. As for the different fabrics, you need to do some research there aforehand (you can write about it in your report, they love that) to see whether cheaper clothes are of different fabrics than the more expensive ones. If they are, you can compare the fabrics used as far as their safety is concerned. If they aren’t, use clothes made of the same fabric.

ok kid this is my area, fire.
So you want variables?
these are what you need to have any consistency or method in your experiment
what temperature was the was the ambient air?
what was the humidity content of the air? (RH)
and do you have the same amount of fuel?- how was that fuel presented
different thicknesses of cloth will cause a different effect on the rate of consumption