Shopping for yourself is definitely difficult with small children. Try short amounts of time with promises of things they like to do after you have "mommy's turn to shop." I spent a lot of time in the Disney Store when mine were little, but they had to spend some time in my stores too. We would go back and forth with stores for them, and stores for me. It also helped that we went often enough that they were used to a similar routine on each shopping trip. We always took time for snacks and playing at the mall play areas, too.
Ideally, you need to have regular shopping outings when the kids are with dad or a babysitter. You'll get so much more accomplished, and not feel so pressured to get everything done during those unavoidable times when you must shop with the kids.
Online Shopping. Moms today are fortunate to have this option, so take advantage of it, even if only to get ideas of where to look and what's out there. Use sites that have free shipping and returns, like Nordstrom and Zappos.
Budgeting. Keep a separate budget for kids clothes and your clothes. Make sure you actually spend your budget, and don't use it on the kids.
At any stage of life, there are challenges with keeping up with style, staying on a budget, and looking your best, but mothers at this stage have some unique issues to deal with.
Changing Bodies. Between pregnancies and nursing, your size and shape changes constantly. Find a few inexpensive pieces that fit, vary them with accessories, and put things away that you hope to fit into later on. That way you're not looking at the visual clutter in your closet of clothes you can't wear.
Toddler Effect on Your Clothes. Your kids get everything from spit-up to mud on your clothes. There are plenty of cute, fashionable clothes that are washable. Save the silky dresses for when you're out without the kids, but don't abandon them completely. Expect to change clothes sometimes during the day, but don't resort to sloppy t-shirts. Look for color, shape and detail in washable fabrics.
Wardrobe Consultant and Personal Shopper. Love to help women match their outside image to their unique inner beauty.