Take a look at Torm; super jerseys at a third of the price of Rapha; I tried my new LS jersey on a longish, coldish ride in Snowdonia last weekend and it was warm and comfortable. Their sizing is accurate.
Here: https://spcycles.com/epages/f16c048...48c-e949-4d87-996e-9f7ec7a844b3/Products/1005
More fool Torm, they should increase their prices.