On February $1,$ Style House contacts Men$$s Wearhouse and informs them that it will not be able to fulfill the order. Men$$s Wearhouse is not pleased, as it had planned a big marketing campaign.

a$.$ When can Men$$s Wearhouse sue Style House, on February $1$ or March $1?$

b$.$ Men$$s Wearhouse purchases suits from another vendor, and the suits from Style House show up on March $1,$ does Men$$s Wearhouse have to accept and pay for the Style House suits?