B.A.
I do not have a child that has gone through it. I am however going through things I never thought I would with a child going into 2nd grade as one of her friends has a phone and the dares for friendship have already started. Here is what I tell my child be kind and friendly with others as long as they do the same to you. If they become insulting, less than friendly, or want you to do things you don't want to do or know you should not do, do not react just walk away. You should be polite with them but not give them the second chance to treat you poorly. If you react it only gives the other person what they wanted in the first place.
As for shaving, if it is needed then go ahead and teach her. At this age cleanliness is huge.
Makeup, has she asked for it? I will not be asking if her friends are wearing it, she is your child and you should be comfortable with when she starts. But when she is allowed call ahead to a makeup counter like clinique or estee lauder and ask to speak to a manager. Ask for the most conservative and best teacher to show her how to put on teen appropriate makeup. This is so it is not coming from you about how much and what color.
As for the phone, is she on her own much? Walking alone/spend time at movies or swimming pools on her own? Then a cell phone would give you peace of mind that she can always call you. They also have ones with GPS, so if needed later you could track where at least her phone is. There are not too many pay phones anymore and you never know when she will be with a kid who has one, but chooses the worst time to follow their parents rules about not letting friends use their phone.
As far as underwear, make sure they are clean, good condition and not granny panties, she doesn't need victorias secret. Also if she know she has on something sexy, well it kind of promotes the idea that you are okay with her being sexy. I'd wait until later when you would be okay with her having sex. I didn't say happy about it.
As for any other brand names, save these items for gifts only and make them rare pieces in her wardrobe. If a family member asks what they can get her for a gift ask for a gift card to the places that she is wanting close from. This way you are not just handing over a 95.00 sweatpant or condoing that her wardrobe needs to be top of the line.
Being made fun of is the least of the worries, keep her safe, warm, fed and if possible happy(I had problems typing the word happy in relation to a teen)
Hope this helps.
Good luck with the teen years.
Barbara