Makroohat of Ihram are some things:
1- Wearing black clothing of Ihram and it is a precaution to renounce that and wearing white Ihram clothing is better.
2- Wearing impure clothing of Ihram and if clothing become impure during Ihram, it is better not to wash them in the state of Ihram, but it is possible to change that clothing.
3- Wearing striped clothing of Ihram.
5- Using henna before Ihram in the way that its effects remain until Ihram.