Divo Boutique's headline offer is 25% off storewide, which applies to anything in their regular inventory. This is the best place to start if you're buying full price items, though the brand also runs seasonal sales and category specific deals that may save you more depending on what's in your basket.
Shopping full price items across the store: The 25% off storewide deal is your best option here. If you're a first time customer, signing up to the newsletter will also give you 15% off, but the 25% deal saves you more, so go with that unless you plan to use your newsletter discount code on a future purchase.
Buying from the main sale section: The 20% off main sale deal applies specifically to items already marked down. Compare this against the 25% storewide offer when you're checking out—whichever produces the larger saving on your basket is the one to use. The storewide deal will usually win on full price items, but the main sale offer may be better if the sale section already has deeper discounts applied.
Shopping summer sale styles: If you're browsing the summer sale section, you might see discounts of up to 50% off already. Stack this with the 20% off main sale deal if both apply to your basket, but check your cart total first—the combination rules at checkout mean you can only use one offer, so confirm which single option gives you the biggest discount.
Buying backpacks: Divo Boutique has a dedicated 30% off backpacks deal. This beats the 25% storewide offer, so apply it when your basket contains backpacks. If you're also buying other items, calculate the saving from 30% off the backpack plus 25% off the rest versus 25% off everything, and use whichever works out cheaper.
Browsing the private sale: Up to 50% off is available on private sale items. This is the deepest discount on the site, so if you find what you want in this section, use it.
First time customer newsletter signup: New shoppers can sign up to the newsletter for 15% off. This is worth doing if you're spending under $60 or so—on a smaller basket, 15% beats most other options. For larger spends, the 25% storewide deal or one of the category specific offers will usually save you more.
Only one offer applies at checkout, so compare your options before you complete your purchase and choose whichever discount produces the largest saving on your total.