Search for items of a certain brand via the filters - you will get a list of brands in which you can tick what you are looking for. The big disadvantage is immediately, of the 'common' brands such as H&M and Zara, if you search for 'black jeans' you immediately get a huge list of search results. You're sweet with that! Sort the results in the order you want, which can be by lowest price, newest item or most relevant.
If you do not find what you were looking for (because your brand may not be in the list), simply enter the brand name in the search field and you will often get results.
If you have found a number of nice items, put them in your favorites list (with the heart). That way you can easily compare later.
Always check who the seller is. Does it already have positive reviews? Of course there are beginners, and then you can give them the benefit of the doubt (sometimes you can also send a message, if you don't get an answer, you already know that the seller isn't online much or just doesn't communicate much). I personally prefer to trade with people who have more than 20 reviews. Also take a look at the content of the reviews.
Are the photos clear? Is it easy to see that the important parts of the garment are to your liking? For example, what you really shouldn't miss outside of the front and back are photos of the (size) label and the zippers / buttons. If the photos are not clear, you can also request additional photos. If you don't know the size of that brand, just ask to measure the garment. Most sellers do this without any problems.
Where is the seller located? In the profile you can see the place of residence. Maybe you can collect your items from this person? Shipping from Belgium or France is not very expensive with Mondial Relay or Homerr, but then the shipping time is a major variable. It can take 3 days, or 3 weeks, or 3 months, I've been through all of that. If you really want to have the ordered item, preferably choose a seller within the Netherlands and use DHL, DPD or UPS as the shipping method, which (usually) cause the least problems.
Is your wishlist item very popular and do you always fish just behind the net? Save a search and regularly check the items that have been added. That's when you get to see the latest new things first!
In addition to the well-known apps such as Vinted and Marktplaats, have you also searched Facebook marketplace or Ebay? Especially for articles from abroad, the last option is often a source of unexpected finds!
For the more exclusive items there is also Vestiaire Collective or Rebelle, but the prices are accordingly. The disadvantage of these websites is that they do not manage the items themselves, but only mediate. Your item will therefore also be checked for authenticity first, so it will take longer before you receive it.
You can never be sure that the item you buy online is exactly as described, or that there might be hidden defects. That's what makes it a real sport. And yes, sometimes it is not too bad, and sometimes it is disappointing.. With a lower price you may dare to take that gamble sooner than with a more expensive item.
Always trust your feeling. If something is too good to be true, it usually is. You don't buy real UGGs in new condition for $20. You don't get an original Gucci belt for $10. But you can be lucky sometimes, if someone grants it to you or just really doesn't understand it yourself. Unfortunately, there are few such sellers left and most people with designer clothes know the approximate value of something and are usually willing to wait for the right buyer.