under 10c or feels like, thin gloves and short sleeved shirt with singlet underneath.
5c and below, long sleeved shirt and tights, and warm hat.
closer to 0c may wear an extra shirt over top of long sleeves.
edit: material is whatever quick dry sports material is available. ive not seen a significant difference in performance between top end (2xu, under armor) and no name dept store / ali amazon / temu brands
Congrats!!