Wigs are incredibly important and it really does complete the female look, because even if a man grows his hair out and has longer hair, it's still not the same as having a feminine style to your hair. But we are not going to talk about wig styles because that varies so wildly from person to person and from one outfit to another. We are going to discuss a few general things about somethings that crossdressers may find useful.
The first is that you'd better make sure that it covers as much or all of your natural hair, such as hairs in the sideburn area. If you are going out, I recommend that to choose a wig that is as close as possible to your own natural hair color if not as exact match. Although it will be much funnier to get either outlandish wigs like the color of purple or red, or to get some that are not your natural hair color, which may enables you to feel more transformed, there is something to consider as far as that goes especially if you have darker hair and are trying to go blonde. Because almost inevitably at some point, your natural hair is going to show through. It could be the wind blows it back, if you brush hairs back tuck behind the ear, peeking out in the back or on the button, or any other things like that. Especially over the life of the wig. As you maintain your wig by brushing it, some of the hairs are going to come out while won't grow back as your natural hair. You can't help it. So eventually, you will get little patches where it's just not as full as it is used to be. If the color matches with your own hair color, you actually extend the life of the wig, for that it is not noticeable.
There's another thing about wig is that you really need to try it on before you but it, even more than a clothe. For clothes, you can see them on a manequin and you can get an idea, while wig need to be seen on your head in conjunction with your face. You don't want to but a wig which looks good on the model but awfully on you. Nonetheless, you may find it is too hard to go to a dedicated wig shop to try it on without giving away your crossdresser identity. Actually, they have experienced a lot crossdressers trying on wig there. You can really feel free to ask it without shame. As long as you are spending money, they don't care. But if that is a little too much for you or that kind of scenario does makes you too nervous, there is another option---costume shops. If you go to larger costume shops, there is usually wig selection. If you give them a premise to make them think that you are buying for a costume, you can try any wig you want. They just assume that you are preparing for some dress-up parties. The important thing is that you really need to try wigs on, so that you can see if it really fits you.
Here are the wigs and hair tips for crossdressers, which also adapt for transgenders. I hope you find them useful.