While you're waiting for experts to answer, you might be interested in some previous threads on pre-modern trends, fashion, and subcultures:

Trends

• Did fashion move as fast in ancient times as it has in the last 200 years or so? - 6 comments, over 1 year old.
• The commenters use art to address the existence of trends amongst the upper classes, but cannot do the same with the lower classes due to the way art was commissioned.
• When did "fashion" emerge in history? - 4 comments, over 6 months old.
• This thread is bereft of analysis, but there are some links provided for further reading.
• Was fashion more slow-paced in the past? - 4 comments, over 3 months old.
• The commenters here talk about mostly the Early Modern period which is beyond what you are looking for, but has some context that applies to the previous eras.
• Why did medieval women wear headscarves? Was it simply fashion, or were they worn for reasons of modesty/morality? - 8 comments, over 3 months old.
• The commenters in this thread talk about traditions dictating clothing choices which may also tie into a picture of pre-modern fashion in general.

Cultural Context

• What is the oldest youth subculture like punk, ska, hipster, sukeban, ganguro and do all eras have examples of them? - comments, over old.
• This thread dives into the context from which subcultures were born and discusses trends and similar matters in Early Modern Europe amongst other places.
• Is our notion of identity different from that in the middle ages? - 7 comments, over 6 months old.
• The commenters in this thread give an overview of the differences in self-identity between Medieval and modern peoples which provides context for the idea of culture and subcultures during the period.

Secret History of Procopius, ch.VII, talks of the bizarre grooming of the Blues in the 400s, which they called the Hun style: long beards & moustache, mullet very long in the back, tight-wristed sleeves on their tunics with lots of fulness along the arm, trousers, boots, all of unconventional design.