Because fashion preferences were once ornate and dependent on precise fits, ready-to-wear clothing really did not become widely available until the early 20th century. Such attire is now available in just about any retail store.

Because ready-to-wear clothing is so readily available, the average person may be unfamiliar with custom-made or tailored items. In fact, a couples’ wedding may be the only instance in their lives when they require the services of a seamstress or tailor.

Fittings are a part of wedding planning, and here’s how brides-to-be can navigate the process of finding and being fitted for a dress.

• Try on sample gowns. The first step is to make your rounds to various gown shops and try on the samples they have available. Most sample sizes will not be the size you wear every day, so expect them to be ill-fitting. Do not be discouraged. Once a gown is chosen, the dress shop will take your measurements and order the gown according to the manufacturer’s sizing guide. Again, this can be shocking, since the size will likely be larger than what you wear in street clothes. Some shops will also order a little larger to allow for adequate tailoring.

• Schedule the first fitting. The first fitting should be anywhere from eight to 12 weeks before the wedding date, according to experts at WeddingWire, an online wedding information provider. This is the time it takes to complete most standard alterations. Complex customizations can take even longer. Brides should also budget a minimum of $500 for alterations, which may or may not be included in the price of the dress.

• Bring shoes and undergarments. Remember to bring along the exact shoes and undergarments you will wear with your gown. A change in shoes or bra/corset can result in the alterations fitting poorly the next time. Bring these items along to all subsequent fittings.

• Speak up. Martha Stewart Weddings suggests speaking up at fittings if anything is uncomfortable or needs tweaking. Seamstresses are masters at their crafts, but only if they understand the desires of the bride.

• Check the details. The second fitting is designed to check that all issues from the first fitting have been addressed, the gown is comfortable and you can move freely. At the last fitting, ask the maid of honor to come along so that she understands how to bustle or help you handle complicated straps or closures.

Open communication with a seamstress and bridal shop can ensure brides-to-be get a dress that fits like a glove.