Pinpoint or as we prefer it, pinpoint oxford, got the same weave as an oxford cloth, although it uses a finer yarn and tighter weave. We would say it's more formal than oxford cloth, but less formal than twill. Think of them as great versatile every-day shirts, but not necessarily the first recommendation for special events. Pinpoint fabrics are generally not transparent and are slightly heavier and thicker than plain-weaved fabrics. Due to their heavier construction, pinpoints are quite durable fabrics.
Here's our core collection of pinpoint oxfords from Mazzarelli, great for layering underneath a sweater or a jacket.