Try the French Yellow Pages - Annuaire Pages Jaunes France and put in Calais (department 59) and 'deguisements' and 'articles de fetes' which might start you off on the right foot.

If you want to be a Roman soldier, you could always look up in an Asterix book to show the shop what effect you'd like to achieve ... they often have Asterix 'bits'! Just remember to change before you take the ferry home!

thanks

ill let my mouse do the clicking