I think getting new clothing is an excellent idea, though I am not so sure that getting clothing for the event of having sex is the best idea (I may be wrong here).
The OP is trying to "kick start" her intimate relationship with her husband. There is a possibility that the first attempt at having sex might fail. Adding plenty of preparation into something that results in failure, tends to make the OP less likely to want to try again (which is not what the OP should want).
A "listening child" having a sleep over isn't mandatory to the OP being intimate, but it helps. The sleep over (at a friends house) can happen whether or not the OP decides to take that first step because children have sleep overs to extend on having fun.
If the husband (for some reason) doesn't want to have sex, he might start to feel that sex attempts are going to happen when the "listening child" goes out for a sleep over, and the husbands reaction might be to nip to the pub for half the night, to avoid having sex. Obviously hoping that it wouldn't be the case is better.
If giving suggestions is considered appropriate, perhaps setting the house up so the OP feels able to relax as much as she can at the first time (in a long time) is best, then getting into bed before the husband, without pyjamas is the next plan (assuming she sleeps with pyjamas).
Good communication is a good idea. When the husband comes up to bed and gets into bet, snuggle over and say that you and he haven't been intimate fora while and you are feeling "in the mood", ask him if he would do the honours to get things started again....and take things from there.
Someone needs to be proactive and initiate something.
The husband is likely to be surprised and perhaps shocked and not know if there is something else he needs to be aware of (if the bloke is unsure).
If the sex doesn't happen, try to keep the progress, so if you snuggled up to the husband, stay there for the night, otherwise you are going back to where you were.
Accept that there might be a few failures and don't give up at the first fall down.
Good luck.