I really like jerseys because of the convenient pockets and wicking fabrics. Even if you don't go with a real jersey, at least get wicking t-shirts like coolmax, varitherm, hydroduct which are similar fabrics. They are all polyesters just different fiber shapes. Sierratradingpost.com and campmor.com often have very good prices on such things, especially on clearance, like coolmax t-shirts for $6-10 that are the same as other places sell for $25-30. I may have some unopened spares that I picked up cheap that I will make you a deal on, both short and long sleeves. You can email me if you like.
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If it ain't broke, mess with it anyway!