Possible Clues:

• Historic accessory for boy's clothes? I'd look almost silly
• Traditional union can open doors for you perhaps
• Traditional union can get you a good job
• Term for group loyalty of those with posh private eduction
• Source of unfair advantage that could result in cold and hostile exchange around jobcentre
• System of favours between those with a privileged education
• Oilcloth does, strangely, as something to wear with advantage?
• Is one bound to show the possibility of influential contacts?
• A sign of education in a reactionary Siamese, we hear
• Symbol of upper class solidarity