I agree with Seaview, when i work at wedding i wear a suit,tie and waistcoat, i blend in nicely. when i do niteclubs i dress down, casual. when i do family portraits or communions i wont wear a tracksuit lol i dress as i want to blend in with the crowd……
Do what you think and what you are comfortable with
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eBay is fairly safe, so just keep an eye on there feedback and you are covered by PayPal anyway, if anything bad happens.
Maybe try Adverts.ie also as you can get great second hand stuff on there for a bargin.