When do you wear a silk jacket?

[texas_jack]

I'm talking about the slubby, not shiney type of silk. I have an Oxxford jacket in off white made of this matierial and I'm wondering what season something like this is worn. It looks like this but in off white.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=360085492742

 

[voxsartoria]

For me, spring and summer.

Chipp:

Same thing for shiny silk.

Oxxford:

- B