A generous return policy is worth more than a small discount on anything you cannot try first. The terms are short and they change the arithmetic.

Who Pays for the Return Journey
Outbound shipping and return shipping are separate questions, and plenty of retailers are generous about the first and strict about the second. Free delivery with paid returns is now the most common arrangement, and the return cost typically runs between five and twelve dollars depending on size and carrier.
That figure belongs in your decision before you order. A clothing purchase where you expect to send one item back carries that cost whether or not you noticed it. Across a year of online shopping it adds up to more than most people save by hunting for codes, which makes it the more productive thing to pay attention to.
Some retailers deduct the return cost from the refund rather than charging it separately, which is easy to miss because the refund simply arrives smaller than expected. Others provide a prepaid label but charge a restocking fee. Both are legitimate when disclosed, and both are disclosed in the policy you did not read.
The Window Is Shorter Than You Think
Return windows are usually stated in days from delivery, not from order, and thirty days is the common standard. The practical window is shorter, because the item has to be back with the retailer or in the carrier network before the clock runs out depending on how the policy is written. Read whether the deadline applies to initiating the return or to the parcel arriving.
Extended holiday windows are real and worth knowing. Many retailers lengthen the period for purchases made in the gift buying months, sometimes to the end of January. This is the one time of year when buying early does not cost you the ability to return, and it makes the earlier shopping genuinely lower risk.
Where a product has a defect, a separate and longer right usually applies under consumer law regardless of the store policy. Those protections are typically measured in months or years rather than days and cover goods that fail to be of satisfactory quality. A store policy cannot remove them, though it will rarely mention them.
Condition Requirements Do the Real Work
Most refused returns are refused on condition, not timing. Tags attached, original packaging, unworn, unwashed and free of odor are standard requirements, and each one is enforceable. For shoes in particular, the box is usually part of the product, and a return in a damaged box or with the box used as the shipping carton can be rejected or discounted.
Hygiene categories are frequently excluded entirely. Underwear, swimwear, earrings, cosmetics and anything with a seal are commonly non returnable once opened, and that exclusion is normal rather than suspicious. It does mean those purchases carry full risk, which is a good reason to buy them from brands whose sizing you already know.
Keep the packaging intact until you have decided. This sounds obvious and is the single most common cause of a return being refused, because the decision to keep or return often happens days after the parcel was opened enthusiastically. Opening carefully costs nothing and preserves the option.
Refund Method and Timing
A refund to the original payment method is the standard you want. Store credit only policies are legal where disclosed and are common on sale items, but they convert a return into a commitment to shop there again. If a store offers credit rather than money for a change of mind return, that is useful to know before rather than after.
Processing times are longer than most people expect. A typical sequence is several days in transit, several more for the warehouse to receive and inspect, and then a banking delay before the money appears. Three weeks end to end is unremarkable. Policies that specify the inspection period are telling you how long to wait before chasing.
Whether the original delivery charge is refunded is a separate clause again. For a change of mind return it usually is not. For a faulty item or an incorrect shipment it generally should be, and asking is reasonable. Keeping the proof of postage on any return is what makes these conversations short.
Match the Policy to the Purchase
The right way to use all of this is to let the policy decide where you buy, not just what you pay. For categories with high fit uncertainty, free returns are worth paying a premium for, because the expected cost of being wrong is high and frequent. For categories where you know exactly what you are getting, the policy barely matters and price should win.
Shoes are the clearest example. Ordering two sizes with free returns is standard practice and effectively free, while the same approach at a store charging for returns costs real money every time. The cheaper headline price loses on the second order, let alone the tenth.
Finally, note the policy somewhere for the retailers you use regularly. Three or four lines covering window, who pays and any exclusions, kept in a phone note, removes the need to read it again and means the information is available at the moment you are deciding rather than after the parcel arrives.
Policies do change, usually quietly and usually in the direction of being less generous, so the note is worth refreshing once a year. Retailers that tightened their returns terms rarely announce it, and the first time most customers find out is when a parcel they expected to send back for free costs them ten dollars in postage.
