Horticultural Fleece

Hi. Am new to all this so sorry if im in wrong place. Could somebody advise what weight of fleece I should be using please? Im in a town, South Yorkshire where winters usually go down to about -2 to -4. If I get 18g fleece, does simply doubling it up give extra protection or doesn't it work like that??
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Thicker fleece should last a bit longer. The main protection is from the air trapped inside - I'd think that 2 layers of thin fleece would be warmer than 1 thick layer.
Brilliant. Thank you for your help. Jane x