This bag sits very tightly and securely on your body. Since it only comes in red, your colour choice is made very easy.
From Farfetch
Zadig&Voltaire - Moonrock leather tote bag - women - Calf Leather/Cotton - One Size - Red
Selfridges
Zadig&voltaire Womens Power Moonrock Grained-leather Shoulder Bag 18x23x6.5cm - POWER