The change of the seasons means it will soon be time to don those sweaters and cardigans, pick out some stylish boots and sport jackets and full-sleeve tops. When you're pregnant over the fall season, it can be hard to figure out how to put together a stylish but functional ensemble that will keep you comfortable as the temperature changes. The secret to looking great this season? It's all about the layers.

Layering your look is a simple way to wear your favorite pieces all year long and create a fresh new look each day. When you're pregnant, you also need to think about staying cool and comfortable when those hormones start to get the best of you. Fall is a great time to layer clothes such as tank tops, short-sleeve tees and button-down blouses with some fresh new pieces such as vests, cable-knit sweaters and long cardigans.

Just make sure you're picking up each piece from the maternity department so you are accommodating for your growing figure. Some of the best layered combinations for the mom-to-be this fall include:

Long chunky-knit cardigans with maternity leggings and a short-sleeve top
Wide-leg corduroy pants with a wraparound top and a long sweater
Dark brown khaki pants with a smock tank top and a long, full-sleeve cardigan
Bootcut jeans with a long v-neck tunic top and contrasting tank underneath
Knit trapeze top with twill pants and topped with a chunky sweater

When you're just lounging at home and need to wear something comfortable during those especially painful or bloated days, stick with the ¾ sleeve baby doll tops, short sleeve faux wrap tops and sleeveless baby doll tops paired with some yoga-style capris or wide-leg pants, and wear a long sweater or cardigan over it if you get cold.

Just remember: even though it's the fall season, your body may not be responding to the actual temperatures outdoors on any given day. If you're feeling especially hot in the middle of October, or feeling chills in early September, adjust your ensemble for the day by layering light and heavy clothing so you can be comfortable all day long.

Staying stylish and fashionable throughout a pregnancy often takes a backseat for many moms-to-be, simply because they're dealing with so many changes, higher stress levels, and juggling a busy schedule. However, you don't have to turn into a fashion victim just because you're expecting. Some careful shopping decisions and building up a basics wardrobe can help you get through those nine months staying chic and stylish. Here are some essential fashion tips for staying stylish during every trimester:

1. Stick with soft and natural fabrics. From organic cotton to light wool blends, stick with the soft fabrics that won't irritate your skin, and designs that aren't too form-fitting. These will put you at ease throughout your days of pregnancy, and a few bold colors and fun prints will help you stay fashionable.

2. Buy your actual size from the maternity department. Many women make the mistake of buying clothes from the regular Misses or Women's department, and just going a few sizes bigger. Your growing figure won't benefit from the extra material, and you'll end up hiding beneath a tent in most cases! Head to the maternity department so that you're buying your usual dress size designed with some minor tweaks.

3. Avoid the empire waist until your second trimester. Contrary to popular belief, the empire waistline will accentuate the tummy area so it won't be flattering to your figure until you're ready to flaunt the baby bump. Stick with loose and flowing styles that elongate your figure and accentuate your natural waistline during your first trimester, then shift over to empire lines as the baby bump begins to show.

4. Buy a maternity bra for overnight use. If you're large-chested, you will need some extra support overnight. Purchase a maternity bra that you can comfortably wear overnight so you can look forward to a restful night throughout your term.

5. Build up your bottoms basics. Jeans, tailored black pants and a simple skirt are three basics you need to get through your pregnancy days. Make sure they're from the maternity department so you have the flexibility of an adjustable waist.

Staying stylish throughout your pregnancy may not be at the top of your priority list, but building your wardrobe doesn't have to be an overwhelming process. Stick with these essential fashion 'dos' so you can be chic and fashionable through every trimester!