I'm partial to the back on my premier half belt. No excess material problems at all. It's the back off the premier work coat.
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When I bought my 30s halfbelt a few years ago it was also a little too roomy in the upper back. I took up calisthenics and now it fits great and I can still layer.
You just have to ask Aero to wipe the pocket off. My Dust Bowl has no chest pocket.