HUDDERSFIELD, England — It was not just the size of its new fan base that caught Huddersfield Town by surprise this summer, but the size of its new fans.

Early in July — little more than a month after the club had secured entry to the Premier League’s promised land, and with little more than a month to go until it made its debut — Huddersfield revealed its jerseys for the season ahead.

Within two weeks, all three editions of the jersey had all but sold out — even though the shirts were available only through the club’s online shop and at one of its two stores here.

The club quickly contacted Puma, its apparel supplier, with an urgent request to deliver a new batch as quickly as possible. It will not arrive until September, but when it does, it will be in a greater variety of sizes than before: In another surprise, there had been a surge of requests for jerseys in 3XL and 4XL.