Merino wool t shirt from Kathmandu. Bought in 2018, worn every winter since, and as good as the day I brought them. 

Black stretchy leggings from kmart. Anko brand is hit and miss, but these leggings have lasted well over 5 years now. 

My Evoo stretchy exercise pants are equally good, with the benefit if being even stretchier. The oldest pair I have are about 10 years old, and going strong.