5°C is cold-weather running that most people enjoy once they're out. a long sleeve and tights, maybe light gloves for the first few minutes. no hat needed unless there's wind.

Long sleeve Micromesh with reflective stitching.
Bandit Micromesh Reflecto Stitch LS Tee →

Stamina fabric scoop neck bra. Three pockets, all-ways stretch support.
Bandit Stamina Scoop Neck Run Bra →
Breathable Micromesh long sleeve for cool runs.
Bandit Women's Micromesh Long Sleeve Tee →
Stamina-V fabric with 37.5 thermoregulation. Unlined, five-pocket system.
Bandit Stamina-V High Waist Legging →between 7°C and 18°C is the transitional band: a long sleeve up top with shorts or half tights below. it's the range where a top layer and bare legs often beats the reverse, since your core cools slower than your legs.