Similar to a shumper. A shicardigan is a cardigan that has a fakeshirt attached to it.
It appears to look like a shirt with a cardigan on top but is actually just a section of shirt with a cardigan.
The wearer seems fashionable while managing to keep themselves cool as they are not actually wearing both items of clothing. (not as useful if weather is bad)
It is the epitome of trendiness.
Hey Malcolm, your looking nice. I like your shirt and is that a new cardigan?
Thanks, but no; it's a shicardigan. A shirt and a cardigan would be too warm.
Shidarya is pretty much just another Aussie slang for the greatings; How are ya? How the shit are ya? It just generated into 'Shidarya'. When my friends use it, we generally drag out the final 'rya' part giving the word more meaning. For Example; Shidaryaaaa....