Weight of American Apparel?

This is a general rule I follow for T-shirts (weight includes bubble wrap packaging which is about 1-2 oz):

2X - 12 oz
XL - 11 oz
L - 10 oz
M - 9 oz
S - 8 oz

This table would be good for the AA "Standard American" style, the "Classic Girl" style I think is about 1 oz less than the "Standard American". I think the amounts are a little on the liberal side, but I'd rather be safe than sorry.

As far as shipping I find First Class to be more cost-effective for anything under 13 oz, and if it's over, shipping two shirts First Class is still more cost-effective than Priority unless you're shipping to a zone close to you (since Priority is zone-based and First Class isn't).

Thanks lincoln! We're planning to use Uline poly mailers which I'm guessing are an oz in weight.

While it may be more cost-effective, I don't think I'll be able to justify running down to the Post Office for every domestic First-Class customer since USPS doesn't offer First-Class through their Click n' Ship.