The exterior of a Gap store in New Jersey. Amanda Krause/Business Insider Gap launched a collaboration clothing line with Victoria Beckham on Friday. The line includes basic T-shirts, a trench coat, denim jeans, a bomber jacket, and more. The pieces are chic and high-quality, but there were some sizing issues. I arrived early at my local Gap expecting a crowd for the Victoria Beckham collaboration. Instead, I found mall walkers — and later, clothes that were as cute as they were hard to wear. It wasn't until nearly 10 a.m. at my New Jersey mall that five shoppers (myself included) formed a makeshift line and gazed through the store's windows for an early look. "They don't have everything in stock," I heard a few say. Still, these fashion fans were ready. T-shirts, trench coats, and denim jeans were quickly pulled off racks once we got inside. After snagging a few to try on myself, I was left feeling equally impressed and disappointed. Everything was cute, but nothing fit on me.…