"What we did was well meant but it didn't look good and in hindsight, was a mistake," spokesman Nick Smith told BBC Sport.
"We are trying to bring in a new dress code but didn't want on day one to turn anyone away and genuinely thought we were treading quite softly."
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Earlier this week, it was announced that women will have to wear hats, rather than fascinators, in the Royal Enclosure at Royal Ascot, one of the highlights of the English summer social season.
For race days outside the royal meeting, the new course dress code states: "In Premier Admission, gentlemen should wear a jacket and tie, smart trousers or smart jeans, no trainers.
"There will be an announcement on the day allowing jackets to be removed, should the weather be hot.
"Ladies should dress for a smart occasion; hats are encouraged but not compulsory."
The orange stickers were fixed to the clothing or badges of racegoers who breached the dress code.
