Borussia Monchengladbach aren't best pleased with Borussia Dortmund's new kit for the 2017-18 season.

Dortmund launched their new home strip with a late-night shopping event at the BVB fan shop on Wednesday, with the design retaining their classic yellow colour but now featuring horizontal stripes which, according to the club, "change from black to yellow and vice versa as they move across the shirt."

�� Beim Late Night Shopping in der FanWelt konnten die Besucher nicht nur bei den Ersten sein, die das neue Trikot in Händen hielten... pic.twitter.com/sE84yKh8oe - Borussia Dortmund (@BVB) May 17, 2017

However, still seemingly holding a grudge over Dortmund's decision to adopt the word "Borussia" in their name, Monchengladbach have now accused their Bundesliga rivals of stealing their current kit design.

First you try to take 'Borussia' off us, and now this! But the way I wear my hat? No, no. @BVB can't take that away from me. pic.twitter.com/DPMZX29zh2 - Gladbach (@borussia_en) May 18, 2017

For what it's worth, Dortmund winger Marco Reus is still a fan of the new strip, labelling the stripes as "really cool," while adding he can't wait to wear it for the first time in his side's last Bundesliga match against Werder Bremen on Saturday and the DFB Pokal final against Eintracht Frankfurt later this month.

"We want to round off the season in style in the new shirts," Reus said of the new kit, which was sold 350 times during the late-night shopping event at BVB Fan World, where the supporters were also treated to autographs from Alexander Isak and Emre Mor as well as from club mascot Emma The Bee.

Initial fan reaction on Dortmund's official Facebook page moaned that the kit was "too expensive," "lacked creativity" and "got worse from year to year."

Monchengladbach are not the only ones to be left unimpressed, then...