Be prepared
Before even setting foot in the store, take a peek into her bra and panty drawer to determine sizing and style. Take note of the letter and number sizing. This is vital when purchasing lingerie, as the wrong size can quickly turn a thoughtful gift into an uncomfortable situation for the both of you.
It’s also important to note the style of lingerie she already has, especially if you are a first-time buyer. You don’t want to purchase something too out of the ordinary for her. You want the gift to be tasteful and not to stray too far out of her personal comfort zone.

“[Typically] if she has a lot of black lingerie, you should choose a gift that is a dark color,” says Lilly Norman of Anastasia’s Boutique in Scottsdale. “Also, if you’ve seen her wear chemise-style (nightgown-style) lingerie, stick with that style as your gift.”

Comfort is just as vital as sex appeal
This is one of the most important pieces of information when gifting lingerie: make sure she feels comfortable.
Lingerie is a very intimate gift and, in many ways, shows how much you know about the person that you’re with. You want it to be tasteful and sexy, but the most important thing is how she feels. This gift should make your girl feel both confident and beautiful.

It would be a mistake to buy her pieces that are completely opposite from anything you’ve seen her in in the past because she may end up feeling self-conscious. Take note of what you’ve already seen her wear and pick pieces that are similar but better. And don’t be afraid to splurge a little on the quality of something because this should be a gift you want to see her in more than once.

“Be thoughtful. Think about her taste and her confidences, not yours,” Norman says. “Remember, if she feels confident and sexy, you’ll reap the benefits.”

And unless the two of you have already established this, avoid pieces that look like costumes. They may fit into your fantasies but typically leave women turned off and uncomfortable.