Door curtains: flush against the door?

[Garald]

Hi,

 

I decided to cover some metal doors with lined curtains (well, no lining yet) so as to limit convection. Workmen just installed the curtain rails (I'm very much not a handyman)... and installed the curtains as you would on a window, i.e. in an ondulating way. Wouldn't it make more sense to have the curtain flat against the surface, so as to minimise air flow?

 

Also, will lining help at all? All it can do is change a bad R very, very slightly better - it doesn't help stopping convection, AFAIK.