Some grooms enjoy the wedding planning just as much as the bride? If they want to get involved in choosing the teal formal dresses, then by all means let them. Men can often have a different outlook than women so they see things differently when choosing the styles. Some bridesmaids might not like the groom choosing what they wear, so it's well worth talking with them first about what they think. Also think about how your husband to be interacts with your bridesmaids in everyday situations, if you have a fiance who is quite blunt and to the point you have to bear in mind that it could upset one of your bridesmaids if he comments negatively about how a dress looks on one of your ladies.
At least if he's involved within the planning process he will feel a part of the day more, and will maybe get more involved in other areas of the wedding which will help you with your workload. Just make sure he knows that you get the final say on whatever decisions need to be made! And if you can decide on the kind of dress before you go shopping for teal formal dresses that will help close in on the chosen style on the day.