Everlane, who offer high quality clothing at reasonable prices do not typically offer international shipping, but they are running a temporary promotion which expires tomorrow. I have shopped at Everlane before and been impressed with the quality/value (even when using a forwarder), they are offering 15$ flatrate shipping to AU.
I would recommend their backpacks, t-shirts and weekender bags.
Feel free to use my referral link, https://www.everlane.com/r/kyrnw5 (gives me store credit)