I always wear one and in 50 years of kilting never thought about not using one until I saw on this forum that some don't use them. I leave one on each kilt that I feel is appropriate to its wear. They rarely ever get changed. My best tank has a nice old antique one with stones inset. My everyday kilts have the old style blanket pin that I grew up with. These are available at our local horse and feed store for $2.00 each.

I have tried the look without but its not for me.