e.l.f. O Face Satin Lipstick (£9)
Spot it: Worn by Cady in class
I like lipsticks that don't make wearing lipstick feel like a full-time job. Essentially something that glides on easily without the need for liner or a magnifying mirror, and that won't jump ship the moment I take a sip from my water bottle. This is a real box ticker, with a creamy, satin texture that's a doddle to swipe onto lips with impressive colour payoff in just one coat. I did my usual apply, blot, reapply and blot again, and that was enough to keep it in place for a good four hours before needing to touch up. It's available in 20 shades from neutral nudes through to deep berry tones – and plenty of pinks for Wednesdays, obvs.