I would take everything I think I might wear on a test run first---right down to the socks--just to be sure nothing rubs or is uncomfortable. Mile 6 is a bad time to find out those old tights rub up and down on my calf where I cut them off. That's just me though and I know you don't have much time before your race. I've had blisters pop up at mile 10 because of socks that I had only used for short runs.
Good luck on your race and be sure to let us know how it goes.
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"We don't stop playing because we grow old; we grow old because we stop playing." George Bernard Shaw
Luna Eclipse/Selle Italia Lady
Surly Pacer/Terry Butterfly
Quintana Roo Cd01/Koobi Stratus
1981 Schwinn Le Tour Tourist
Jamis Coda Femme