Okaywear has a straightforward buying discount as the hero offer on this page: buy four or more styles and get 80% off a fifth style with the featured code. This deal rewards shoppers who are ready to make a larger wardrobe investment in one visit.
For smaller purchases under $89, your best option depends on how many items you are adding. If you are buying one or two styles, use the 25% off code to get a solid discount across your whole order. If you are buying three styles, the code for 25% off your fourth style saves more money, since it takes 25% off a full price item while the 25% off order code takes 25% off the total. On a $120 order of three items at $40 each, for example, the code for one style at 25% off leaves you with $110 to pay (a $10 saving), compared to $90 with the 25% off code (a $30 saving), so the 25% off order code wins. If you are buying four styles, choose between the 50% off code for four items and the 80% off code for five items depending on whether you can stretch to a fifth style. If you are holding at four, the 50% off code applies to your fourth item only and saves less than the 25% off code on your order total. If you are buying five or more styles, the featured 80% off code on your fifth style gives you the biggest saving and should be your choice.
At spending levels between $89 and $129, the automatic free shipping deal and the fixed $15 off over $129 do not change the picture. Keep using the code that matches your item count.
For orders over $129, you now have automatic savings to account for. The $15 off over $129 kicks in automatically. Once you reach $189, the $30 off discount takes over and beats the $15. On a $200 order of five styles, the 80% off code on the fifth style saves you roughly $40 to $50 depending on individual prices, whereas the $30 off automatic discount saves a flat $30, so the code is still your winner. On a $400 order, you hit the $80 off threshold automatically, which is a bigger saving than the 80% off code would give on a single item, so let the automatic discount apply and skip the code.
To choose between code and automatic discount at any basket size: work out what each saves, then pay whichever total is lower. The codes cannot be combined with the automatic discounts or with each other, so apply the one that leaves you with the smallest final bill.