Layering underwear query

For those who have done it under Australian conditions; how effective have you found layering a Patagonia "Thermal weight" zip neck over the UL Patagonia "Everyday"
I didn't need a new winter base layer but they were on sale at a small discount so I bought a zip neck top; partly to help out a small retailer in trouble because of the Covid disaster in the ski fields
A few times the Powerstretch and R1 tops have been too warm for active use and I thought that perhaps it would make a reasonably LW summer warm layer.
I have tried it in city and town conditions once and thought it was effective but I wasn't working hard
I didn't need a new winter base layer but they were on sale at a small discount so I bought a zip neck top; partly to help out a small retailer in trouble because of the Covid disaster in the ski fields
A few times the Powerstretch and R1 tops have been too warm for active use and I thought that perhaps it would make a reasonably LW summer warm layer.
I have tried it in city and town conditions once and thought it was effective but I wasn't working hard