[HBR] enamel coated verses silk or cotton coated

[rob]

Various old radio projects specify coils made of fine wire.
The old LITZ wire that  was cloth...silk or  cotton coated is hard to 
come by these days so
I was wondering if replacing LITZ with the readily available copper 
enamel coated wire was
a bad thing to do when building regen recievers.
Sometimes coils are specified to be wound  with thicker 20 or 22 guage wire.
Is it OK to use teflon coated  wire for such coils if the original 
intent was an insulated coil
of silk or cotton?