Here's a link on clothing synthesis:
http://www.kongregate.com/forums/228-wartune/topics/335000-clothes-and-wings-costslv2 clothes = lv1 clothes + 1 core + zero charm = 2 cores (cost-wise clothes = core)
lv3 clothes = 2x lv2 clothes + 1 charm
lv4 clothes = 2x lv3 clothes + 2 charms
lv5 clothes = 2x lv4 clothes + 3 charms
lv6 clothes = 2x lv5 clothes + 4 charms
…and so on
lv2 wings = lv1 wings + 5 core + zero charm (5 cores cost slightly less than lv1 wings)
lv3 wings = 2x lv2 wings + 5 charm
lv4 wings = 2x lv3 wings + 10 charms
lv5 wings = 2x lv4 wings + 15 charms
lv6 wings = 2x lv5 wings + 20 charms
…and so on
To synthesize clothing, make sure that you unequip it first.