I started backing for SLS and now I'm getting nervous that I won't be prepared. Can anyone answer my following questions on what to pack from experience? "2-3 pairs of shoes" - are tennis shoes fine or should we bring a pair of dress shoes to wear to class? Will we need to bring extra clothes to wear during down time? (It says "collared shirts" are appropriate when the class or PT uniform is not worn.) Any other tips or guidelines for packing would be greatly appreciated. Thanks to all and good luck!