For a Silkroad Cold Blader, Garment is perfect. This leaves you with a low mag defence though, but Garment makes up for it. Str builds have a high phy defence already, and the Cold phy buff and passive gives you an even higher phy defence. Garment is also useful for the 20% speed increase, and reduces your MP Silkroad gold consumption by 20% which is extremely useful when PvPing with 25% Snow Shield. At the cap, your Garment set needs to be fully pimped and at least +5 to give you any chance against your own level in PvP.
This is less important when your lower level. Same applies for Light Bladers too. Phy and Mag % - Obviously the higher the %, the more defence you will have. For most people, 41% is minimum. This is the least important white, so if you are struggling for money, you can probably leave these without it making a considerable difference. Parry Ratio %- the most important white on your set. We will explain if you do not know what parry does.