I used to be prejudiced against it, but once I got used to it I realised it was actually pretty cool.
洋服を買ってからなかなか着ない時もありますよね。
毛嫌い = prejudice
毛嫌いする = to be prejudiced (against); be averse to
見慣れてきたら = once I got used to (seeing) it
イケてる = cool; sexy
結構イけてる = pretty cool
私には似合わない = (it) doesn't suit me
私には似合わないと10年ほど前に悟りそれ以来避けてきた = I realised about ten years ago that it doesn't suit me and I've been avoiding it ever since.