The issue here would actually be more along the lines of "fair use" than anything else. I can use a trademark as long as the use of that trademark doesn't imply some endorsement of the product. That's why you see trademarked logos in parodies sometimes. In this case, does naming your team Dolce & Gabbana imply some kind of endorsement? Perhaps, perhaps not. Again, if I'm an Italian fashion house, shooting off letters to All-star cheer teams to cease and desist using a logo is probably very low on my list of priorities.
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