Oh wow, I'm from Den Haag! I'm sure you'll have a great time here
I'm not too aware of denim shops, but I can definitely point out a few streets that carry nice stores.
OK, for more luxurious stores, visit the area around the "Noordeinde" (North end) and "Plaats". There's a store that carries Chanel called "Fred van Wordragen", just when you leave the "Plaats".
When you walk down the street with the Chanel store, called the "Hoogstraat", you'll get to a Tommy Hilfiger store, H&M, and lot's of small boutiques, as well as the well-known commercial ones, and a couple of shoestores.
When you're looking for designer shoes, there's a store called "De Rode Loper" (The red carpet), but I would not recommend you to go there 'cause the staff is really, really bad.
Walking down the Hoogstraat, you'll get to a chic department store called "Maisson De Bonneterie", carrying brands such as Tommy Hilfiger Denim, Ralph Lauren, Armani, Burberry, etc.
Looking from the exit of that store, when you walk straight on, you'll eventually find a store called "Boston Trader", carrying casual clothes by Armani Jeans.
You might find what you're looking for there.
When you get back to "Maisson De Bonneterie", you can walk down the very busy street close to it, and you'll probably find a few denim stores there.
Eventually, you'll get to another department store called "De Bijenkorf", carrying brands like Tommy Hilfiger, Ralph Lauren, Hugo Boss, etc.
Hope I've helped you a bit with this guide
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