Back in the day, jeans were a straightforward affair. They were blue, came in one style, and were built for rugged play.

But somewhere along the way, things got all fancy-pants with boot cuts, skinny legs, and an endless variety of embellishments.

Thankfully, ESP No. 1 is bringing some sense back to dungarees. The brainchild of a husband-and-wife duo who saw the need for simple separates, the unisex collection for kids focuses on timeless, affordable wardrobe basics.

The jeans have an easy, tapered fit and come in vintage blue, black, or white wash (think denim you’d want, cut down to kiddie sizes). Pair with a tee of the softest Japanese cotton, and your little rambler will be set. It couldn’t be simpler.

Select styles available at Sweet William, 112 North Sixth Street, at Berry Street, Williamsburg (718-218-6946 or sweetwilliamltd.com); Makié, 109 Thompson Street, between Prince and Spring Streets (212-625-3930 or makieclothier.com). To see styles, go to espno1.com.

HEAR
Freckleface Strawberry: the Musical
What: Actress Julianne Moore’s best-selling story about self-acceptance is set to song and dance.
Why: Messages of tolerance and friendship make for a heartwarming tale.
When: Wed., 2 p.m. & 7 p.m.; Thurs. & Fri., 7 p.m.; Sat., 11 a.m., 2 & 4:30 p.m.; Sun., noon & 3 p.m.
Where: New World Stages, 340 W. 50th St., b/t Eighth & Ninth Aves. Tickets at 212-239-6200 or online at telecharge.com. Adults and children, $39-$68.50.

SEE
Little Red Riding Hood
What: Kids in the audience help the wolf out in this adaptation of the classic Brothers Grimm tale.
Why: Musical numbers make it something to sing about.
When: Thru Oct. 31. Sat. & Sun., 3 p.m.
Where: Galli Theater, 38 W. 38th St., b/t Fifth & Sixth Aves. Tickets at 212-810-6485 or e-mail newyork@galli-group.com. Adults, $20; children 2-17, $15.

SCREAM
Boo at the Zoo
What: A hay maze, live music, magic shows, and more kick off the not-so-spooky season.
Why: Who doesn’t love a costume parade?
When: Thru Oct. 31. Sat. & Sun., 10 a.m.-5:30 p.m. (Also Mon., Oct. 11.)
Where: Bronx Zoo, 2300 Southern Blvd., Bronx (718-220-5100). Tickets online at bronxzoo.com. Adults, $16; children, $12; children in costumes, free.

Photo: Courtesy of ESP No. 1