No

Snopes.com

snopes.com: Loony Laws in Arizona

No, Tucson has no such law.

snopes.com: Loony Laws in Arizona

A century ago, it was a misdemeanor offense there for a person to appear in public in the dress "not of his or her sex," a law which presumably could have been applied to women wearing pants, but neither women nor pants were specifically mentioned.

Yes

azpbs.org

Arizona Stories

…for women to wear pants in Tucson

dumblaws.com

Dumb Laws in Arizona. Crazy Arizona Laws. We have weird laws, strange laws, and just plain crazy laws!

Women may not wear pants.

podiatry-arena.com

Fetishist faces court over foot kissing - Podiatry Arena

In Tucson, it is illegal for women to wear pants.

totallyuselessknowledge.com

Totally Useless Knowledge - Looney Laws

In Tucson, it is illegal for women to wear pants.

md.lp.org

MdLP - Weird Laws

In Tucson, it is illegal for women to wear pants.

forumgarden.com

Weird Laws - ForumGarden

In Tucson, it is illegal for women to wear pants.