It might not be a straightforward sizing issue if your brand-new Calvin Klein boxer briefs are bunching up between your legs. The exact style might not fit your body type well, even if you bought it in your typical size.
To make sure you have the correct measurements, double-check the Calvin Klein size chart on their website or the packaging. Occasionally, experimenting with an alternative cut, like a "body defining" or "relaxed fit," can increase legroom and decrease bunching.
Another factor to consider is the material of the boxer briefs. Despite being smooth and elastic, microfiber is more likely to bunch than cotton. A better fit might be achieved by selecting a fabric that breathes better, like cotton.
Furthermore, the problem could also be exacerbated by the elastic in the leg opening being too tight. The fabric may bunch up if the elastic feels unduly restrictive. You should be able to find a more comfortable fit and less bunching if you check these factors.
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