It wasn't until some time later that I happened across an article on the Holdfast blog entitled "Long Hair and Femininity," and at the end of it was this link to a resolution of the synod of 2003, as printed in the FP magazine. I've copied and pasted it here:
At its most recent meeting, in May 2003, the Synod reaffirmed the Church's adherence to the Scriptural standard expressed in this Resolution originally passed in 1970:
There is evidence that the "permissiveness" of the age has influenced the Church. In particular this is the case in the dress of the women, and in the hair styles of both men and women.
The Word of God demands of women that they be dressed in modest apparel, and the Synod urge the women of the Church to give heed to this counsel. Not only does it require modesty of dress but also distinction in dress between the sexes. The practice of men and women wearing clothes which obliterates this distinction is quite contrary to God's Word and expressly declared to be an abomination to Him. "The woman shall not wear that which pertaineth unto a man neither shall a man put on a woman's garment: for all that do so are abomination unto the Lord thy God" (Deut 22:5).
The Word of God clearly teaches that the hair of women should be long and the hair of men (and boys) short. Long and short are relatives. To argue from hence that the matter cannot be determined is to cast the most serious and solemn aspersion upon the Divine wisdom. "Doth not even nature itself teach you that, if a man have long hair, it is a shame unto him? But if a woman have long hair, it is a glory to her: for her hair is given her for a covering" (1 Cor 11:14,15).
The Church must therefore condemn these practices as contrary to God's Word and direct her people to seek the grace of the Lord Jesus Christ to enable them to live unspotted in the world.
So there you have it. I'm not sure what I was expecting exactly, but I was happy with the way this resolution was written, in that it does not compromise on important Biblical principles of modesty and distinction in dress; and also in that it is no more specific than the Bible regarding how exactly one should be feminine or masculine (the specific application of these principles being left up to the discretion of church government within a given culture/era).
Slightly off topic, but it would be nice if past resolutions of Synod were more accessible online. I am sure that many of the resolutions are somewhere to be found in past issues of the FP magazine, which are indeed available online, but they aren't searchable, so it is quite difficult to find something specific when desired.